Security Analysis of Network Protocols
信息与通信工程专业英语
Signal and System
Mathematical Foundations in Information and Communication Engineering
Mathematics plays a fundamental role in information and communication engineering, promoting the theoretical frameworks and analytical tools for system design and analysis
contents
目录
Frontier Technologies in Information and Communication Engineering Practice and Application of Information and Communication Engineering Reading and Writing Skills for Information and Communication Engineering English
01
Fundamentals of Information and Communication Engineering
Summary
Information theory is a branch of engineering that studies the quantification, transmission, and processing of information It provides fundamental principles for the design of communication systems
Network Information Security Technologies
Network Information SecurityTechnologiesIn the age of digitalization, the importance of network information security technologies cannot be overstated. As businesses, governments, and individuals increasingly rely on digital networks to store, transmit, and access critical information, the need for robust security measures has become paramount. This article aims to provide a comprehensive overview of network information security technologies, discussing their importance, types, and applications.Types of Network Information Security Technologies1. Firewalls: Firewalls are a crucial component of network security, acting as a barrier between a trusted internal network and the untrusted external network (typically the internet). They filter incoming and outgoing network traffic based on security rules, blocking unauthorized access and preventing malicious actors from penetrating the network.* Example: A company implements a firewall to protect its internal network from external threats. By carefully configuring the firewall rules, the company ensures that only authorized traffic can pass through, reducing the risk of data breaches.2. Intrusion Detection and Prevention Systems (IDS/IPS): These systems monitor network traffic for suspicious or malicious activity, such as unauthorized access attempts or malware infections. IDS/IPS can detect and alert administrators to potential threats, while some systems can also take proactive measures to block or mitigate attacks.* Example: An educational institution deploys an IDS/IPS to monitor traffic on its network. When the system detects an unusual pattern indicating a potential attack, it immediately alerts the IT team, allowing them to investigate and take action before any damage occurs.3. Encryption Technologies: Encryption is a crucial tool for protecting sensitive data from unauthorized access. By encrypting data, organizations can ensure that even if the data is intercepted by a third party, it cannot be easily decrypted and understood.* Example: A healthcare provider uses encryption to secure patient records stored on its network. By encrypting the data, the provider ensures that even if the network is compromised, the sensitive information remains protected.4. Access Control and Identity Management: These technologies allow organizations to manage and control who can access specific resources on their networks. By implementing strong access controls and identity management systems, organizations can ensure that only authorized individuals can access sensitive data or perform critical tasks.* Example: A financial institution implements multi-factor authentication for access to its online banking system. This means that users must provide multiple pieces of evidence (such as a password, a PIN, and a one-time passcode sent to their mobile phone) to gain access, greatly reducing the risk of unauthorized access.Applications of Network Information Security TechnologiesNetwork information security technologies are crucial in various sectors, including:1. Financial Services: Financial institutions handle sensitive customer data and transactions, making them prime targets for cybercriminals. Strong network security measures are essential to protect against fraud, data breaches, and financial losses.2. Healthcare: Healthcare providers store vast amounts of sensitive patient data on their networks. Ensuring the security of this data is crucial to maintaining patient trust and complying with regulatory requirements.3. Government and Defense: Governments and defense organizations handle highly sensitive information that could have national security implications if compromised. Robust network security measures are essential to protect against cyberattacks and espionage activities.In conclusion, network information security technologies play a pivotal role in protecting critical information and assets in today's digital world. By understanding the types and applications of these technologies, organizations can make informed decisions about their network security needs and take proactive measures to mitigate the risk of cyberattacks and data breaches.。
(全程版)网络安全检测报告(信息安全)英文版
(全程版)网络安全检测报告(信息安全)英文版Full Version Network Security Assessment Report (Information Security) In today's fast-paced digital world, ensuring the security of our online systems is of utmost importance. This comprehensive network security assessment report aims to provide a detailed analysis of the security measures in place and identify any potential vulnerabilities that could compromise the integrity of the system.The assessment was conducted by a team of experienced cybersecurity professionals who utilized a variety of tools and techniques to thoroughly test the network's defenses. The report includes an overview of the network architecture, an analysis of the current security protocols in place, and a detailed list of vulnerabilities discovered during the assessment.Key findings of the assessment include:- Multiple outdated software versions that are susceptible to known vulnerabilities.- Weak password policies that could easily be exploited by malicious actors.- Lack of proper encryption protocols for sensitive data transmission.- Inadequate logging and monitoring mechanisms to detect and respond to security incidents.Recommendations for improving the network security posture include:- Implementing regular software updates and patches to address known vulnerabilities.- Enforcing strong password policies and implementing multi-factor authentication for added security.- Deploying encryption protocols such as SSL/TLS to secure data in transit.- Enhancing logging and monitoring capabilities to better detect and respond to security incidents.Overall, this network security assessment report serves as a valuable resource for organizations looking to enhance their information security practices and protect their valuable data from cyber threats. By following the recommendations outlined in this report, organizations can significantly reduce their risk of a security breach and safeguard their digital assets.。
保障信息安全的专业技术领域：信息安全专业技术,不可或缺!
保障信息安全的专业技术领域：信息安全专业技术，不可或缺！Ensuring Information Security in the Professional Technical Field: Information Security Expertise is Indispensable!In today's digital age, information security has become a critical concern for individuals, organizations, and governments worldwide. With the increasing reliance on technology and the growing sophistication of cyber threats, it is imperative to have professionals with specialized skills and knowledge in the field of information security. These experts play a crucial role in safeguarding sensitive data, preventing cyber attacks, and mitigating potential risks.The field of information security encompasses a wide range of technical disciplines, including network security, cryptography, risk management, incident response, and ethical hacking. Professionals in this field possess a deep understanding of computer systems, network protocols, and vulnerabilities that can be exploited by malicious actors. Theyare equipped with the expertise to design, implement, and manage security measures to protect information assets effectively.One of the key areas in information security is network security. This involves securing computer networks and the data that flows through them. Network security professionals are responsible for implementing firewalls, intrusion detection systems, and virtual private networks to safeguard against unauthorized access and data breaches. They also monitor network traffic and analyze logs to identify any suspicious activities or potential threats.Cryptography is another crucial aspect of information security. It involves the use of mathematical algorithms to encrypt and decrypt data, ensuring its confidentiality and integrity. Cryptography experts develop and implement encryption protocols and algorithms to protect sensitive information from unauthorized disclosure or tampering. They are also involved in the design and analysis of cryptographic systems to ensure their resilience against attacks.Risk management is an essential component of information security. Professionals in this field assess potential risks, identify vulnerabilities, and develop strategies to mitigate them. They conduct risk assessments, implement security controls, and establish incident response plans to minimize the impact of security incidents. Risk management experts also stay updated with the latest threats and vulnerabilities to proactively address emerging risks.In the event of a security breach or incident, incident response professionals play a critical role in containing and mitigating the damage. They have the expertise to investigate security incidents, identify the root cause, and implement remediation measures. Incident response teams work swiftly to minimize the impact of the incident, restore system functionality, and prevent similar incidents from recurring.Ethical hacking, also known as penetration testing, is another important field within information security. Ethical hackers are authorized professionals who simulate cyber attacks to identify vulnerabilities in systems and networks. By exploiting these vulnerabilities, they provide valuableinsights to organizations on areas that need improvement and strengthening. Ethical hacking is a proactive approach to information security, helping organizations stay one step ahead of potential attackers.信息安全专业技术是保障信息安全的重要领域，无论是个人、组织还是政府，在当今数字化时代都面临着巨大的安全威胁。
希尔斯通 S 系列网络入侵防御系统（NIPS）S600 S1060 S1560 S190
Hillstone S-SeriesNetwork Intrusion Prevention System (NIPS)S600 / S1060 / S1560 / S1900 / S2100 / S2160 / S2700 / S2660 / S3560 / S3500 /S3860 / S3900 / S5500 /S5560As the threat landscape continues to evolve aggressively, an increasing number of network pro-tection technologies have quickly emerged. Among these various technologies, Intrusion Preven-tion System (IPS) remains one of the most widely deployed solutions, regardless of platform or form factor.Hillstone Network-based IPS (NIPS) appliance operates in-line, and at wire speed, performing deep packet inspection, and assembling inspection of all network traffic. It also applies rules based on several methodologies, including protocol anomaly analysis and signature analysis to block threats. Hillstone NIPS can be deployed in the network to inspect traffic left undetected by perimeter solutions, and is an integral part of network security systems for its high-performance, no compromise, best-of-breed protection capability and broad and flexible deployment scenarios.Product HighlightsUnparalleled Threat Protection without Performance CompromiseThe Hillstone NIPS platform has the most comprehensive high performance inspection engine, combined with the best-of-breed signature partnering with leading technology part-ners, providing customers the highest threat detection rate with the lowest total cost of ownership (TCO). Hillstone IPS engine has 99.6% blocking rate of static exploits and 98.325% blocking rate of live exploits (reported by NSS Labs).The Hillstone NIPS platform provides high throughput, low latency and maximum availability to maintain efficient secu -rity operations without compromising network performance. NIPS combines protocol analysis, threat reputation and other features that deliver threat protection from Layer 2 to Layer 7, including ARP attack, Dos/DDoS attack, abnormal protocols, malicious URLs, malwares and web attacks.Granular Reporting with User Targeted ViewpointsHillstone NIPS provides comprehensive visibility based on protocol, application, user and content. It can identify more than 4,000 applications, including hundreds of mobile and cloud applications.Bringing multiple sources together, the system can identify contextual information to make proper blocking decisions. With a granular and robust reporting function, it offers visibil-ity across different views:• Unique templates, based on whether you are a business system administrator, a security administrator or the CIO or executive.• Organized Threat Content – whether a security, system risk, network threat or traffic view – in order to help you clearly understand the risk and make the right decision.Product Highlights (Continued) FeaturesIntrusion Prevention• 12,700+ signatures, protocol anomaly detection, rate-based detection, custom signatures, manual, automatic push or pull signature updates, integrated threat encyclopedia• IPS Actions: monitor, block, reset (attackers IP or victim IP, incoming interface) with expiry time• Packet logging option• Filter based selection and review: severity, target, OS, application or protocol • IP exemption from specific IPS signatures• IDS sniffer mode• IPv4 and IPv6 rate based DoS protection with threshold settings against TCP Syn flood, TCP/UDP/SCTP port scan, ICMP sweep, TCP/UDP/SCIP/ICMP session flooding (source/destination)• Active bypass with bypass interfaces• Predefined prevention configuration• Support web server protection, including CC attack, external link attack, iframe, cross-site request forgery (CSRF) attack, etc.• Support protection of brute force attack including FTP, MSRPC, POP3, SMTP, SUNRPC and telnet• Support weak password detection for FTP, MSRPC, POP3, SMTP, SUNRPC and telnet• Threat Details support URI and Attack Data Decoding• Support MPLS frame inspectionThreat Correlation Analytics• Correlation among unknown threats, abnormal behavior and application behavior to discover potential threat or attacks• Multi-dimension correlation rules, automatic daily update from the cloud Advanced Threat Detection• Behavior-based advanced malware detection• Detection of more than 2000 known and unknown malware families including Virus, Worm, Trojan, Spyware, Overflow etc• Real-time, online, malware behavior model database updateAbnormal Behavior Detection• Behavior modeling based on L3-L7 baseline traffic to reveal anomalous network behavior, such as HTTP scanning, Spider, SPAM, SSH/FTP weak password, and spyware• Detection of DDoS including Flood, Sockstress, zip of death, reflect, DNS query, SSL DDos and application DDoS• Supports inspection of encrypted tunneling traffic for unknown applications • Real-time, online, abnormal behavior model database updateAntivirus• Manual, automatic push or pull signature updates• Flow-based antivirus: protocols include HTTP/HTTPS, SMTP, POP3, IMAP, FTP/ SFTP, SMB• Compressed file virus scanning Attack Defense• Abnormal protocol attack defense• Anti-DoS/DDoS, including SYN Flood, DNS Query Flood defense• ARP attack defense• IP scanning and port scanningURL Filtering• Flow-based web filtering inspection• Manually defined web filtering based on URL, web content and MIME header• Dynamic web filtering with cloud-based real-time categorization database: over 140 million URLs with 64 categories (8 of which are security related)• Additional web filtering features:- Filter Java Applet, ActiveX or cookie- Block HTTP Post- Log search keywords- Exempt scanning encrypted connections on certain categories for privacy• Web filtering profile override: allows administrator to temporarily assign different profiles to user/group/IP• Web filter local categories and category rating override• Support allow/block list• Customizable alarmAnti-Spam• Real-time spam classification and prevention• Confirmed spam, suspected spam, bulk spam, valid bulk• Protection regardless of the language, format, or content of the message• Support both SMTP and POP3 email protocols• Inbound and outbound detection• Whitelists to allow emails from trusted domain/email addresses• User-defined blacklistsCloud-Sandbox• Upload malicious files to cloud sandbox for analysis• Support protocols including HTTP/HTTPS, POP3, IMAP, SMTP and FTP• Support file types including PE, ZIP, RAR, Office, PDF, APK, JAR and SWF• File transfer direction and file size control• Provide complete behavior analysis report for malicious files• Global threat intelligence sharing, real-time threat blocking• Support detection only mode without uploading filesData Security• Web content filtering and file content filtering• Support file filtering with over 100 file formats• Support network behavior recordingEase of Deployment and Centralized Management Deploying and managing the Hillstone NIPS is simple, with minimum overhead. It can be deployed in the following modes to meet security requirements and ensure optimal network connectivity:• Active protection (intrusion prevention mode), real time monitoring and blocking.• Passive detection (intrusion detection mode), real time monitoring and alert.The Hillstone NIPS can be managed by the Hillstone Security Management Platform (HSM). Administrators can centrally register, monitor, and upgrade NIPS devices deployed in differ-ent branches or locations, with a unified management policy across the network for maximum efficiency.Features (Continued)Botnet C&C Prevention• Discover intranet botnet host by monitoring C&C connections and block further advanced threats such as botnet and ransomware• Regularly update the botnet server addresses• Prevention for C&C IP and domain• Support TCP, HTTP, and DNS traffic detection• IP and domain whitelistsIP Reputation• Identify and filter traffic from risky IPs such as botnet hosts, spammers, Tor nodes, breached hosts, and brute force attacks• Logging, dropping packets, or blocking for different types of risky IP traffic• Regular IP reputation signature database upgradeApplication Control• Over 4,000 applications that can be filtered by name, category, subcategory, technology and risk• Each application contains a description, risk factors, dependencies, typical ports used, and URLs for additional reference• Actions: block, monitor• Provide multi-dimensional monitoring and statistics for applications running in the cloud, including risk category and characteristics• Support encrypted applicationQuality of Service (QoS)• Support encrypted application• Max/guaranteed bandwidth tunnels or IP/user basis• Tunnel allocation based on security domain, interface, address, user/user group, server/server group, application/app group, TOS, VLAN• Bandwidth allocated by time, priority, or equal bandwidth sharing• Type of Service (TOS) and Differentiated Services (DiffServ) support• Prioritized allocation of remaining bandwidth• Maximum concurrent connections per IP• Bandwidth allocation based on URL category• Bandwidth limit by delaying access for user or IPIPv6• Management over IPv6, IPv6 logging and HA• IPv6 tunneling, DNS64/NAT64 etc• IPv6 routing protocols, static routing, policy routing, ISIS, RIPng, OSPFv3 and BGP4+• IPS, Application identification, Antivirus, Access control, ND attack defense VSYS• System resource allocation to each VSYS• CPU virtualization• Non-root VSYS support IPS, URL filtering, Policy, QoS, etc.• VSYS monitoring and statistics• Support backup of all VSYS configurations at onceSSL Proxy• SSL offload: SSL traffic decryption• SSL require/ exempt: SSL traffic allowed or block based on the policy rules without decryptionFlexible Traffic Analysis and Control• Support 3 operation modes: Route/NAT (layer 3) , Transparent (layer 2) with optional bypass interface, and TAP mode (IDS Mode) with Hillstone Firewall Integration• Traffic analysis and control based on policy rules by source/destination zone, source/destination IP address, users, service or applications High Availability• Redundant heartbeat interfaces• AP and peer mode• Standalone session synchronization• HA reserved management interface• Failover:- Port, local & remote link monitoring- Stateful failover- Sub-second failover- Failure notification• Deployment Options:- HA with link aggregation- Full mesh HA- Geographically dispersed HAVisible Administration• Management access: HTTP/HTTPS, SSH, telnet, console• Central Management: Hillstone Security Manager (HSM), web service APIs • Two-factor authentication: username/password, HTTPS certificates file• System Integration: SNMP, syslog, alliance partnerships• Rapid deployment: USB auto-install, local and remote script execution• Dynamic real-time dashboard status and drill-in monitoring widgets• Storage device management: storage space threshold customization and alarm, old data overlay, stop recording.• Language support: EnglishLogs and Reporting• Logging facilities: local storage for up to 6 months, multiple syslog servers and multiple Hillstone Security Audit (HSA) platforms• Encrypted logging and log integrity with HSA scheduled batch log uploading • Reliable logging using TCP option (RFC 3195)• Detailed traffic logs: forwarded, violated sessions, local traffic, invalid packets • Comprehensive event logs: system and administrative activity audits, routing & networking, VPN, user authentications, WiFi related events• Log aggregation: support aggregation of AV and C&C logs• IP and service port name resolution option• Brief traffic log format option• Granular Reporting with User Targeted Viewpoints- HA Management/C-level View- Business System Owner View- Network Security Administrator ViewStatistics and Monitoring• Application, URL, threat events statistic and monitoring• Real-time traffic statistic and analytics• System information such as concurrent session, CPU, Memory and temperature• iQOS traffic statistic and monitoring, link status monitoring• Support traffic information collection and forwarding via Netflow (v9.0)• Cloud-based threat intelligence push service• Geographical distribution of external network attacksCloudView• Cloud-based security monitoring• 24/7 access from web or mobile application• Device status, traffic and threat monitoring• Cloud-based log retention and reporting500 GB (optional)Dimension (W×D×H, mm)16.9 × 11.8 × 1.7 in(430×300×44mm)17.1×12.6×1.7 in(436x 320x 44mm)16.9 x 14.8 x 1.7 in(430x375x44mm)Weight14.3 lb (6.5 kg)14.33 lb (6.5kg)22.0 lb (10 kg)Temperature32-104°F (0-40°C)32-104°F (0-40°C)32-104°F (0-40°C) Relative Humidity5-85% (no dew)10%~95% (no dew)5-85% (no dew)14 GbpsConsumption 1 + 1 1 + 1 1 + 1Dimension (W×D×H, mm)16.9 × 19.7 × 3.5 in(430×500×88mm)16.9 × 19.7 × 3.5 in(430×500×88mm)17.1×21.3×1.7 in(436x542x44mm)Weight35.3 lb (16 kg)35.3 lb (16 kg)32.6 lb (14.8kg)Temperature32-104°F (0-40°C)32-104°F (0-40°C)32-104°F (0-40°C) Relative Humidity5-85% (no dew)5-85% (no dew)10%~95% (no dew)ModuleIOC-S-4GE-B-LIOC-S-4SFP-LIOC-S-4GE-BIOC-S-4SFPIOC-S-8SFPIOC-S-4GE-4SFPI/O Ports 4 x SFP Ports4 × SFP Ports 4 × GE and 4 × SFP Ports Dimension slot)1U (Occupies 1 generic slot)slot)1U (Occupies 1 generic slot)generic slot) 1U (Occupies 1 generic slot)Weight0.22 lb (0.1 kg)0.22 lb (0.1 kg)0.33 lb (0.15 kg)0.33 lb (0.15 kg)0.55 lb (0.25 kg)0.55 lb (0.25 kg)ModuleIOC-S-2SFP+IOC-S-4SFP+IOC-S-4SFP-BIOC-S-2SFP+-BIOC-S-4SFP+-BIOC-S-4GE-B-HIOC-S-4GE-4SFP-HI/O Ports 2 × SFP+ Ports 4 × SFP+ Ports 4 × SFP Bypass Ports 2 × SFP+ Bypass Ports 4 × SFP+ Bypass Ports 4 × GE Bypass Ports 4 × GE and 4 × SFP Ports Dimension 1U (Occupies 1 generic slot)1U (Occupies 1 generic slot)1U (Occupies 1 generic slot) Weight0.44 lb (0.2 kg)0.88 lb (0.4 kg)0.33 lb (0.15 kg)ModuleIOC-S-8GE-B-HIOC-S-8SFP-HIOC-S-4SFP-HIOC-S-2SFP+-HIOC-S-4SFP+-HIOC-S-4SFP-B-HIOC-S-2SFP+-B-HI/O Ports 8 × GE Bypass Ports 8 × SFP Ports 4 × SFP Ports 2 × SFP+ Ports 4 × SFP+ Ports 4 × SFP Bypass Ports 2 × SFP+ Bypass Ports Dimension 1U (Occupies 1 generic slot)1U (Occupies 1 generic slot)1U (Occupies 1 generic slot) Weight0.55 lb (0.25 kg)0.33 lb (0.15 kg)0.88 lb (0.4 kg)Module OptionsNOTES:(1) IPS throughput data is obtained under HTTP traffic with all IPS rules being turned on;(2) Maximum concurrent connections are obtained under TCP traffic; and it can be upgraded with Additional Enhanced License (AEL);(3) New sessions are obtained under TCP traffic.Unless specified otherwise, all performance, capacity and functionality are based on StoneOS5.5R5. Results may vary based on StoneOS ® version and deployment.ModuleIOC-S-4SFP+-AIOC-S-2MM-BE-AIOC-S-2SM-BE-AIOC-S-2QSFP+-AI/O Ports 4 × SFP , MM bypass (2 pairs of bypass ports) 2 × QSFP+Dimension 1U1UWeight2.09 lb (0.96 kg)2.09 lb (0.96 kg)2.09 lb (0.96 kg)2.09 lb (0.96 kg)。
用英文介绍网络安全专业
用英文介绍网络安全专业Network Security is an ever-evolving field that focuses on protecting computer networks and the data they store or transmit from unauthorized access or attack. It plays a critical role intoday's digital world where information is constantly being shared and stored online.In the world of cybersecurity, network security professionals play a crucial role in ensuring the integrity, confidentiality, and availability of data within a network. They are responsible for implementing various security measures to protect against threats such as unauthorized access, data breaches, malware, and other cyber-attacks.To excel in this field, network security professionals must have a deep understanding of various networking concepts, protocols, and technologies. They need to be familiar with different operating systems, such as Windows, Linux, and UNIX, as well as network devices and infrastructure like routers, switches, and firewalls.Network security professionals are skilled in vulnerability assessment and penetration testing, which involves identifying weaknesses in a network's security infrastructure and simulating attacks to evaluate its resilience. They use various tools and techniques to assess the strength of a network's defenses and identify potential vulnerabilities that could be exploited by hackers.Furthermore, network security professionals are responsible for implementing access controls and enforcing security policies to ensure that only authorized users can access sensitive information.They deploy firewalls, intrusion detection and prevention systems, and encryption technologies to safeguard data against unauthorized access or theft.Due to the increasing frequency and sophistication of cyber-attacks, network security professionals must stay up-to-date with the latest trends and advancements in the field. They need to be able to anticipate new threats and develop proactive measures to counter them. This often involves continuous learning, obtaining certifications, and participating in training programs to enhance their skills and knowledge.In addition to technical expertise, network security professionals must possess good problem-solving and analytical skills. They need to be able to analyze and interpret logs, reports, and network traffic data to detect anomalies and identify potential security breaches. They must also be able to respond quickly and decisively to security incidents, minimizing the impact on the network and the organization.Network security professionals have a wide range of career opportunities in industries such as finance, healthcare, government, and technology companies. They can work as security analysts, network administrators, incident responders, or consultants. With the increasing demand for skilled professionals in this field, network security offers promising career prospects and job security. In conclusion, network security professionals play a critical role in safeguarding computer networks and the data they contain. Their expertise in implementing and maintaining security measures isvital in protecting against the constant threat of cyber-attacks. With the ever-growing reliance on digital information, the importance of network security will only continue to increase, making it a compelling and rewarding field to pursue.。
协议解析方案英文
Protocol Parsing SolutionIntroductionThe Protocol Parsing Solution is a software development approach that enables the interpretation and analysis of various protocols used in computer networks. This document aims to provide a comprehensive overview of this solution, discussing its key components, benefits, and implementation considerations.Key Components1.Protocol Specification: The first step in the protocol parsing solutionis to define the protocol specifications. This includes identifying the structure and format of the protocol messages, as well as the expected behavior andcommunication flow. The protocol specification is typically defined using aformal language, such as the Extended Backus-Naur Form (EBNF), which allows for clear and unambiguous definition of the protocol grammar.2.Parsing Engine: The parsing engine is responsible for interpretingthe protocol messages according to the defined protocol specification. Itprocesses the incoming network data, extracts relevant information from the protocol messages, and updates the internal state of the system accordingly.The parsing engine typically uses a variety of techniques, such as finite state machines, regular expressions, and context-free grammars, to analyze andparse the protocol messages.3.Message Validation: Message validation is an essential part of theprotocol parsing solution. It ensures that the received messages adhere to the defined protocol specification and are free from any errors or anomalies. The validation process involves checking the syntactic correctness, semanticintegrity, and conformance to the protocol rules. Any invalid or malformedmessages are rejected to maintain the reliability and integrity of the system.4.Data Extraction: The protocol parsing solution also includes theability to extract relevant data from the parsed protocol messages. This caninclude retrieving specific fields or parameters, calculating statistics or metrics, or performing more complex operations on the extracted data. The extracted data can be used for various purposes, such as monitoring networkperformance, generating reports, or triggering specific actions based onpredefined conditions.5.Logging and Monitoring: To facilitate troubleshooting and analysis,the protocol parsing solution should include logging and monitoringcapabilities. This allows the system to record the processed messages, anyvalidation errors or warnings, and other relevant information. Additionally, themonitoring component enables real-time monitoring of the protocol traffic,providing insights into the network behavior and performance.Benefits•Standardization: The protocol parsing solution brings standardization to the interpretation and analysis of various protocols. Bydefining the protocol specifications in a formal language, the solution ensures consistent and accurate interpretation of the protocol messages acrossdifferent systems and applications.•Efficiency: With an efficient parsing engine and optimized algorithms, the protocol parsing solution can handle high volumes of network trafficwithout compromising performance. This enables the real-time processing and analysis of the protocol messages, providing timely insights and actions.•Flexibility: The protocol parsing solution can be easily adapted to support different protocols by creating and integrating new protocolspecifications into the parsing engine. This flexibility allows for the seamless addition of new protocols or the modification of existing ones withoutsignificant changes to the overall solution architecture.•Reliability: By validating the received messages against the protocol specifications, the solution ensures that only valid and conforming messages are processed. This helps to prevent potential vulnerabilities, errors, ormalicious attacks that may result from the handling of invalid or malformedmessages.•Extensibility: The protocol parsing solution provides a foundation for implementing additional features and functionalities. For example, it can beextended to support protocol-specific optimizations, encryption or securitymechanisms, or integration with other systems or frameworks.Implementation ConsiderationsWhen implementing the protocol parsing solution, the following considerations should be taken into account:•Protocol Complexity: Different protocols may vary in complexity, with some protocols requiring more advanced parsing techniques orspecialized processing algorithms. The implementation should consider thecomplexity of the protocols that need to be supported and ensure that theparsing engine can handle them effectively.•Performance Optimization: To achieve optimal performance, the implementation should focus on using efficient data structures, algorithms, and processing techniques. This includes minimizing memory usage, reducingparsing overhead, and optimizing the handling of large or fragmented protocol messages.•Error Handling and Resilience: The protocol parsing solution should have robust error handling mechanisms to handle unexpected orerroneous situations. This includes proper handling of validation errors,graceful recovery from parsing failures, and appropriate logging and reporting of errors.•Security Considerations: As the protocol parsing solution deals with network traffic, security considerations are paramount. The implementation should include measures to mitigate potential security risks, such as inputvalidation, sanitization of parsed data, and protection against malicious attacks or exploits.•Testing and Validation: Comprehensive testing and validation are crucial to ensuring the correctness and reliability of the protocol parsingsolution. This includes both unit testing of individual parsing components and integration testing with real-world protocol traffic.ConclusionThe Protocol Parsing Solution provides a reliable and efficient approach to interpret and analyze various protocols used in computer networks. With its key components, such as the protocol specification, parsing engine, message validation, data extraction, and logging capabilities, the solution enables accurate protocol parsing, validation, and analysis. By considering implementation considerations, such as protocol complexity, performance optimization, error handling, security, and testing, a robust and scalable protocol parsing solution can be developed to meet specific requirements and provide valuable insights into network behavior.。
毕业论文ARP防火墙技术的研究
毕业论⽂ARP防⽕墙技术的研究毕业论⽂ARP防⽕墙技术的研究论⽂指导⽼师信息⼯程系学⽣所在系部信息⼯程系专业名称⽹络技术论⽂提交⽇期年⽉⽇论⽂答辩⽇期年⽉⽇2015年⽉⽇论⽂题⽬:arp防⽕墙技术的研究专业:⽹络技术学⽣:签名：指导⽼师:签名：摘要当今的信息社会是建⽴在计算机⽹络的基础之上的，⽹络信息安全形势⼗分严峻。
⽹络协议安全是⽹络安全的重要环节，对⽹络协议的分析、利⽤越来越受到⼈们的关注。
ARP协议是⽹络协议中的基础协议，虽然ARP协议使⽤起来⾮常⽅便快捷，但其中却隐藏着很多漏洞。
本⽂⾸先对ARP 协议进⾏了详细的分析，深⼊了解了ARP 协议的⼯作原理，并对ARP 欺骗发⽣的条件和欺骗原理做了深⼊的介绍，同时总结了ARP 欺骗攻击的检测⽅法，细致的分析了对各种不同的ARP 欺骗⽅式相对应的防御⼿段。
其次针对局域⽹中出现的 ARP 欺骗的攻击⽅式进⾏有针对性的分析，使⽤抓包⼯具截获攻击包后进⾏相关研究，并制定出防御局域⽹中出现的ARP欺骗的⽅法，同时对该⽅法进⾏适当改进以提⾼防御效率。
ARP欺骗病毒⼀直是⽹络中爆发范围较⼴且很难根除的顽疾，最近⼏年针对ARP欺骗病毒的防御研究在不断进⾏，但由于互联⽹布局的复杂性特征，很难在防御该病毒⽅⾯获得统⼀的管理和部署，本⽂提出的检测和防御⽅法经⼩范围应⽤取得了较好的效果，希望在以后的继续学习与研究过程中能够将该⽅法完善并推⼴。
【关键词】ARP欺骗，ARP协议，病毒防御【论⽂类型】应⽤基础Title：Arp firewall technology researchMajor：Network technologyName：WangQingFu Signature：Supervisor：LiCuiHong Signature：AbstractIn today's information society is established on the basis of computer networks, network information security situation is grim. Network security protocol is an important part of network security, network protocol analysis, the use of more and more attention.ARP protocol is the basic protocol in network protocols, although the ARP protocol to use a very convenient, but it still has many loopholes. This article first has carried on the detailed analysis of ARP protocol, in-depth understanding of the working principle of ARP protocol, and do an in-depth introduction to ARP deception condition and the principle of deception occurs, and summarizes the detection method of ARP spoofing attack, detailed analysis of the corresponding ARP cheating way to various means of defense.Secondly, the LAN ARP spoofing attack occurred in the way are analyzed, the related study is carried out using the capture tool for capturing the attack packets, and to develop the method of ARP spoofing the emergence of defense in local area network, the method was improved to enhance defense efficiency.ARP cheating virus outbreak has been in the network range is wider and very difficult to eradicate diseases, in recent yearsthe research defence against ARP cheating virus in the ongoing, but due to the complexity of the layout of the characteristics of the Internet, it is difficult to obtain a unified management and deployment in defense of the virus, detection and prevention methods proposed in this paper by small the range of application and achieved good results, I hope in the future to continue to study and research process can take the method to improve and promote the.[keyword] ARP spoofing, ARP protocol, virus defense[type of Thesis] applied fundamental⽬录摘要 (2)⽬录 (5)第 1 章绪论 (6)1.1 课题背景和意义 (8)1.2 国内外研究现状 (8)1.3 论⽂的研究内容及组织结构 (10)1.3.1 论⽂的研究内容 (10)1.3.2 论⽂的组织结构 (10)第 2 章 ARP 协议 (11)2.1 ARP 协议介绍 (11)2.1.1 地址解析的作⽤ (11)2.1.2 直接映射法 (12)2.1.3 动态地址解析法 (12)2.1.4 动态地址解析的缓冲区与⾼效率 (13)2.2 ARP 协议的应⽤ (13)2.2.1 ARP 的标准与历史 (13)2.2.2 ARP 地址详述与基本操作 (14)2.2.3 ARP 信息的格式 (15)2.2.4 ARP 缓存 (17)2.2.5 代理ARP (18)2.3 ARP 欺骗 (19)2.3.1 ARP 欺骗原理 (19)2.3.2 ARP 欺骗的攻击⽅式 (20)2.3.3 ARP 攻击的检测 (21)2.3.4 ARP 病毒的防御 (22)2.4 本章⼩结 (24)第 3 章 ARP 病毒检测与防御 (24)3.1 遭受ARP 病毒攻击的症状及危害 (24)3.2 检测与分析 (25)3.2.1 正常⽹络数据的捕获与分析 (25)3.2.2 ARP 欺骗数据包的捕获与分析 (26)3.3 ARP 欺骗的防御 (27)3.3.1 针对⽹关ARP 欺骗的防御 (27)3.3.2 针对⽹内主机ARP 欺骗的防御 (28)3.4 ARP 欺骗防御⽅法的改进 (29)3.5 本章⼩结 (29)总结......... .. (29)参考⽂献 (30)致谢 (31)第1 章绪论1.1 课题背景和意义随着互连⽹的发展，⽹络的安全问题随之浮出⽔⾯，并⼀直是计算机⽹络安全体系的重要⽅⾯。
信息安全英语翻译 -
学院：理学院学号：1308105066班级：信安（3）班姓名：张令宁信息安全英语：网络安全原理与实践Chapter 1. An Introduction to Network Security 第1章简介网络安全This chapter covers the following key topics:本章包括以下主要内容：•Network Security Goals— This section discusses the goals of implementing security on a network.•Asset Identification— This section discusses the need to define the assets in a network that need to be protected against network attacks.•Threat Assessment— This section discusses how to recognize the threats unique to a network setup.•Risk Assessment— We discuss what risk means and how it needs to be evaluated for all network assets in order to set up meaningful safeguards.•Constructing a Network Security Policy— We use this section to discuss how to set up a network security policy in light of the definitions established in the previous sections.•Elements of a Network Security Policy—We discuss the pieces that come together to form a network security policy.•Implementing a Network Security Policy— This section discusses technical and nontechnical aspects of implementing a networksecurity policy.•Network Security Architecture Implementation—We discuss how the network policy can be translated into a secure networkarchitecture.•Audit and Improvement— We discuss how audits and continuous improvements are necessary for a successful network security policy implementation.Case Study— You see how the theories discussed in this chapter can be put into effective use.•网络安全Goals-本节讨论在网络上实现安全的目标。
brilliantlysimplesecurityand：出色的简单安全
brilliantly simple security and controleffectively and more efficiently than any other global vendor.Security used to be about identifying code known to be bad and preventing it from breaching the organization’s network perimeter. T oday, that’s not enough. Increased employee mobility, flexible working and visitors plugging into the corporate systems are all leading to the rapid disappearance of the traditional network.As IT departments fight to regain control, a fragmented security strategy that involves separate firewalls, anti-virus and anti-spam is no longer acceptable.Against a background of escalating support desk costs and relentless demands for increased access to corporate information, the challenge of providing reliable protection from today’s sophisticated, blended threats is complicated by other factors. The need to enforce internal and regulatory compliance policies, and the emergence of the ITdepartment as a key supporter of business strategy and processes, has made itsimportance broader and more critical than ever before.The result is a recognition that today’s security requires not just the blocking of malware, but also the controlling of legitimate applications, network access, computer configuration, and user behavior. The solution to the problem lies in enforcing security through control. Sophos Enterprise Security and Control does just that.“We’re seeing different types of threat, a vastly changed environment and organizations struggling with as many as ten point-products. Our response is simple – we’ve integrated the protection they need into a single, easily managed solution.”Richard JacobsSophos Chief T echnology OfficerEvolving threat –the need for control»»Unifying multiple threat technologies at the web, email and endpointEnterprise Security and Control gives you a brilliantly simple way to manage the cost and complexity of keeping your organization threat-free.Defeating today’s and tomorrow’s threats Sophos provides ongoing rapid protection against multiple known and emerging threats. 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You can ensure that securityprotection on your computers is up to date and enabled, certify computers before and after they connect to your network, and prevent unauthorized users from connecting.Giving real integration todeliver faster, better protectionNo matter what stage of the process you are talking about, we take a completely integrated approach. At the threat analysis level, SophosLabs combines malware, spam, application and web expertise. At the administrative level, you can manage all threats with single, integrated policies, and at the detection level, our unified engine looks for the good and the bad at every vulnerable point, in a single scan.Driving down costs through simplification and automationOur approach of easy integration andsimplification for any size network allows you to achieve more from existing budgets. At-a-glance dashboards, remote monitoring, and automation of day-to-day management tasks free you to tackle business problems rather than having to maintain the system.“We’ve engineered an intelligent engine that simultaneously scans for all types of malware, suspicious behavior, and legitimate applications – to maximize the performance of our endpoint, web and email solutions.Security and control, in a single scan.”Wendy DeanSophos VP of Engineering»Over 100 million usersin 150 countries relyon Sophos“It doesn’t really matter anymore where the threat comes from – webdownload, email attachment, guest laptop – the lines are blurring. All thatmatters is that you don’t get infected, and our exceptional visibility andexpertise ensure you won’t.”Vanja SvajcerSophos Principal Virus ResearcherExpertise and technology for real securityAt the heart of our expertise is SophosLabs,giving you the fastest response in theindustry to emerging threats, and deliveringpowerful, robust security. With an integrated global network of highly skilled analysts with over 20 years’ experience in protectingbusinesses from known and emerging threats,our expertise covers every area of network security – viruses, spyware, adware, intrusion, spam, and malicious URLs.Integrated threat expertise, deployment and detectionMillions of emails and web pages analyzed every day Thousands of malicious URLs blocked every day Innovative proactive technologies forpre-execution detection»»»»Constant independent recognition including 36 VB100 awards Automated analysisGenotype database with terabytes of data»»»“The excellence of our web, email and phone support services really sets us apart from our competitors. We provide 24-hour support, 365 days a year. When customers call us they speak directly tosomeone who is able to solve their problem.”Geoff SnareSophos Head of Global Technical Support»Web, email andtelephone support included in all licensesSophos NAC AdvancedAdvanced features designed specifically for enterprise network access control requirements. Providing easy deployment across existing network infrastructures, controlled access to the network, and enforced computer compliance with security policy before and after connecting to the network.Improving security through control for web, email and endpointEnterprise Security and Control delivers complete protection for desktops, laptops, mobile devices, file servers, your email gateway and groupware infrastructure and all your web browsing needs – in one simple license.It is also possible to subscribe separately to the Web, Email and Endpoint Security and Control services. In addition, there is a more advanced network access control (NAC) option for larger organizations.Web Security and ControlManaged appliances providing safe and productive browsing of the web, with fully integrated protection against malware, phishing attacks, drive-by-downloads, anonymizing proxies,spyware, adware, inappropriate visiting of websites, and data leakage from infected computers.Email Security and ControlManaged email appliances and protection for Exchange, UNIX and Domino servers, providingunique integration of anti-virus, anti-spam, anti-phishing and policy enforcement capabilities to secure and control email content.Endpoint Security and ControlA single automated console for Windows, Mac and Linux computers, providing integrated virus, spyware and adware detection, host intrusion prevention, application control, device control, network access control and firewall.Multiple threat protectionAnti-virus Anti-spywareAnti-adware and potentially unwanted applications Application control – VoIP , IM, P2P and moreDevice control – removable storage and wireless networking protocols Behavior analysis (HIPS)Client firewall Anti-spam Anti-phishingEmail content controlMalicious website blocking Productivity filteringReal-time web download scanning Automatic anonymizing proxy detection Control of guest access Blocking unknown or unauthorized users »»»»»»»»»»»»»»»»Full details of each of our products can be found at and on separate technical datasheetsSophos Professional ServicesSophos Professional Services provides the right skills to implement and maintain complete endpoint, web and email security , ensuring rapid, customized, deployment of our products.Unrivalled round-the-clock supportOur globally managed support team provides web, email and telephone support. 24x7x365 technical support is included for all products and you can call us for one-to-one assistance at any time.Simple pricing and licensingOne simple, subscription-based license provides web, email and telephone support and all future updates to protection, management and product upgrades.“We’re seeing a tremendous rise in organizations of all sizes switching to us from legacy security vendors. Like the leading independent analysts and industry watchers, they trust us, they trust our products, they trust our vision.”Steve MunfordSophos Chief Executive OfficerOur unique approach is why analysts see us as the clear alternative to Symantec and McAfee, and why over 100 million users, including the world’s leading business and security organizations, trust Sophos.The analyst view“Buyers who prefer a broad and comprehensive EPP suite with impressive management capability, especially NAC...will do well to consider Sophos.” Gartner, Magic Quadrant for Endpoint Protection Platforms 2007The customer view“We’ve been delighted by the high level of dedicated support and expertise delivered by Sophos, particularly given our need for a fast implementation.”Chris Leonard, European IT Security and Compliance Manager, HeinzThe industry view“Sophos... consistently beat McAfee and Symantec in ease-of use which should reduce recurring costs in any size enterprise.”Cascadia Labs, Comparative Review, Endpoint Security for Enterprises Sophos customers include: CitgoDeutsche Postbank AGGE, IncGulfstreamHarvard UniversityHeinzHong Kong UniversityInterbrewMarks & SpencerNew York UniversityOrangeOxford UniversityPulitzerSainsbury’sSiemensSociété GénéraleToshibaUniversity of HamburgUniversity of OtagoUS Government AgenciesWeleda AGXerox Corporation»»»»»»»»»»»»»»»»»»»»»»»the clear alternative to Symantec and McAfeeBoston, USA |Oxford, UK204。
浅析计算机网络安全(英文 含中文翻译)
X X X X 学院计算机专业英语班级计科学号12姓名日期2015-12-Security of Computer Network System Abstract: This paper discussed the secure and dependable problem about the computer network system. On some aspects: the importance of network security basic theory function and the method of solving a problem etc. Good views for solving the problem are put forward. It strengthens people’s consciousness on network security.Key words: Computer network Virtual private network Encryption techniques FirewallIntroduction: Along with the computer network technology development the network security and the reliability have become the question of common interest by all users. The people all hoped their own network system can move reliably not external intruder disturbance and destruction .Therefore solves the network security and the reliable problem carefully is a guarantee the network normal operation’s premise and safeguard.First: the importance of the network security. With the information developing fast today the computer network obtained the widespread application but along with the network information transmission capacity growing faster some organizations and departments benefit the speed up with the service operation in the network while the data has also suffered to extent attack and destruction. The aggressor may intercept the information in the network steals the user’s password the database information also may tamper with the database content the forge users status denies own signature. And what is more the aggressor may delete the database content the destroy node releases computer virus and so on. This cause data security and own benefit have received the serious threat. According to American FBI US Federal Bureau of Investigation invest the network security creates the economic loss surpasses 17 billion dollars every year.75 corporation report finance loss is because the computer system security problem creates. More than 50 safe threat come from inside. But only 59 loss could be possible estimate. In China the economic loss amount in view of financial domain and the banknegotiable securities computer system security problems creates has reached as high as several hundred million Yuan also sometimes occurs in view of other profession network security threat. Thus it can be seen regardless of is the mean attack or unconscious disoperation will all be able to bring the inestimable loss to the system. Therefore the computer network must have the enough strong security measure. Regardless of is in the local area network or in WAN the network security measure should be Omni-directional in view of each kind of different threat and the vulnerability so that it can guarantee the network information’s secrecy the integrity and the usability.Second: Network security rationale. International Standardization Organization ISO once suggested the computer security the definition was: “The computer system must protect its hardware the data not accidentally or reveals intentionally the change and the destruction.”In order to help the computer user discrimination and the solution computer network security problem the American Department of Defense announced “the orange peel book”orange book official name is “credible computer system standard appraisal criterion”has carried on the stipulation to the multiuser computer system security rank division. The orange peel book from low to high divides into the computer security four kinds of seven levels: D1 C1 C2 B1 B2 B3 A1.Above allD1 level does not have the lowest safety margin rank C1 and the C2 level has the lowest safety margin rank B1 and the B2 level has the medium safekeeping of security ability rank B3 and A1 belongs to the highest security rating. In the network concrete design process it should act according to each technology standard the equipment type the performance requirement as well as the funds which in the network overall plan proposed and so on the overall evaluation determines one quite reasonably the performance high network security rank thus realization network security and reliability.Third: The network security should have function. In order to adapt the information technology development well the computer network application system must have following function: 1 Access control: Through to the specificwebpage the service establishment access control system in arrives the overwhelming majority attack impediment in front of the attack goal. 2 Inspects the security loophole: Through to security loophole cyclical inspection even if attacks may get the attack goal also may cause the overwhelming majority attack to be invalid. 3 Attack monitoring: Through to specific webpage service establishment attack monitoring system but real-time examines the overwhelming majority attack and adopts the response the motion for example separation network connection recording attack process pursuit attack source and so on. 4 Encryption Communication: Encrypts on own initiative the communication may enable the aggressor to understand the revision sensitive information. 5 Authentication: The good authentication system may prevent the aggressor pretends the validated user. 6 Backup and restoration: The good backup and restores the mechanism may causes the losses when the attack as soon as possible restores the data and the system service. 7 Multi-layered Defense: The aggressor after breaks through the first defense line delays or blocks it to reach the attack goal. 8 Sets up the safe monitoring center: Provides the security system management the monitoring the protection and the emergency case service for the information system.Fourth: The network system safety comprehensive solution measures. If want to realize the network security function we should carry on the Omni-directional guarding to the network system and thus formulate the quite reasonable network security architecture. Below on the network system security problem proposes some guard measure. Physics safe may divide into two aspects: One is the artificial harm to the network the other is the network to the users. Most common thing is the constructor who did not understand to the buried cable clearly thus lead to the destruction of electric cable this kind of situation may through standing symbolized the sign guards against Has not used the structure wiring the network to be able to appear the user frequently to the electric cable damage this needs to use the structure wiring to install the network as far as possible Artificial or naturaldisaster influence when to consider the plan. The access control security the access control distinguishes and confirms the user limits the user in the already activity and the resources scope which is authorized. The network access control safe may consider from following several aspects. 1 password: The network security system most outer layer defense line is network users registering in the registration process the system would inspect the user to register the name and the password validity only then the legitimate user can enter the system. 2 The network resources’host the attribute and the visit jurisdiction: The network resources mainly include the resources which shared files the shared printer network users and so on that all the network users can use. The resources were the host to manifest the different user to the resources subordinate relations such as builder modifier and group member and so on. The resources attribute expressed itself deposit and withdrawal characteristics as can read by who write or the execution and so on. The visit jurisdiction mainly manifests in the user to the network resources available degree in using assigns the network resources to be the host the attribute and the visit jurisdiction may effectively in the application cascade control network system security. 3 Network security surveillance: The network surveillance is generally called for “the network management”its function mainly is carries on the dynamic surveillance to the entire network movement and handles each kind of event promptly. May understand simply through the network surveillance discovers and solves in the network security problem such as the localization network fault point seizes the IP embezzler the control network visit scope and so on. 4 Audit and track: Network audit and track which is including the network aspect resources use network breakdown and system keeping. It composed generally by two parts: One the recording event soon each kind of event entirely records in the document. Two carries on the analysis and the statistics to. Data transmission security, transmission security requirements to protect the information on the network is transmitted to prevent the passive and active violations. The security of data transmission can take the following measures: (1)encryption and digital signature: digital signature is the receiver of data used to confirm the sender of the data is true and correct. (2) firewall: firewall (Firewall) is a security measure that is widely used in Internet. It can be used to set up a series of components in different network or network security domain. It can detect, limit and change the data flow of the firewall, and detect the information, structure and running status of the network as far as possible, so as to realize the network security. (3) Username or Password certification: the authentication method is the most commonly used as an authentication method for the operating system, telnet (remote login), rlogin (remote login), but the process is not encrypted, that is, password is easy to be monitored and decryption. (4) authentication using the algorithm: radius (Remote Authentication Dial protocol, OSPF (open routing protocol), SNMP Security Protocol use shared Security Key (key), and the abstract algorithm (MD5) certification, but abstract algorithm is an irreversible process, therefore, in the authentication process, by the information cannot be calculated Security Key shared, so the sensitive information in the network transmission. The algorithm is mainly used on the market are mainly MD5 and SHA - 1. (5) authentication and encryption based on PKI: using PKI (public key system). This method has a high security level, which is integrated with the technology of the algorithm, asymmetric encryption, symmetric encryption, digital signature, and so on. This authentication method is currently used in the fields of email, application server access, customer authentication, firewall authentication, etc.. This kind of authentication method is very safe, but it involves a relatively heavy certificate management task. (6) virtual private network (VPN) technology: VPN technology mainly provides two-way communication in the public security, the transparent encryption scheme to ensure data integrity and confidentiality.In summary, for the security of computer network transmission, we must do the following. First, we should strictly limit access to the Internet users of the system information and resources, this function can be achieved by setting the Net Screen firewall on the access server. Second, we should strengthen the identityauthentication of Internet users, using RADIUS and other special authentication server. On the one hand, it can achieve the unified management of Internet users account; on the other hand, in the process of identity verification using encryption means to avoid the possibility of leakage of the account. Third: The use of encryption technology in the process of data transmission, to prevent data theft. One way is to use for Business Security PGP to encrypt data. Another approach is to use the VPN technology provided by Net Screen firewall. VPN in the provision of network data encryption, but also provides a single user of the encryption software, that is, the use of software encryption technology to ensure the security of data transmission.浅析计算机网络安全摘要：针对计算机网络系统存在的安全性和可靠性问题，本文从网络安全的重要性、理论基础、具备功能以及解决措施等方面提出一些见解，并且进行了详细的阐述，以使广大用户在计算机网络方面提高安全防范意识。
network security翻译
network security翻译网络安全（network security）是指保护计算机网络免受未经授权的访问、使用、泄露、破坏或干扰的技术措施。
它涵盖了各种安全措施，旨在确保网络和网络中的数据的机密性、完整性和可用性。
网络安全包括以下方面的保护措施：1. 防火墙（Firewall）：防火墙是一种网络安全设备，用于监控和控制网络流量，阻止未经授权的访问。
例如，防火墙可以限制特定IP 地址或端口的访问，从而保护网络免受恶意攻击。
例句：Our company has implemented a state-of-the-art firewall to protect our network from unauthorized access.（我们公司已经部署了最先进的防火墙，以保护我们的网络免受未经授权的访问。
）2. 加密（Encryption）：加密是一种将数据转换为无法理解或解读的形式的技术，以保护数据的机密性。
加密可以应用于数据在传输过程中的保护，也可以用于存储在计算机或服务器上的数据。
例句：We use end-to-end encryption to ensure the privacy and security of our communications.（我们使用端到端加密来确保我们通信的隐私和安全。
）3. 虚拟专用网络（Virtual Private Network，VPN）：VPN是一种通过公共网络（如互联网）建立安全连接的技术。
它通过加密和隧道技术，使用户能够安全地访问私有网络或远程资源。
例句：I always connect to my company's network using a VPN when I work remotely.（我在远程工作时，总是使用VPN连接到我公司的网络。
）4. 侦测和预防系统（Intrusion Detection and Prevention Systems，IDPS）：IDPS是一种用于检测和阻止网络攻击的软件或硬件设备。
信息安全术语
信息安全技术术语中英文1.0 Network Security 网络安全1.1 Implementsecurity configuration parameters on network devices and othertechnologies. 在网络设备和其他设备上实施安全配置参数Firewalls 防火墙Routers 路由器Switches 交换机Load Balancers 负载均衡Proxies 代理Web security gateways Web安全网关VPN concentrators VPN网关NIDS and NIPS 网络入侵检测与网络入侵防范Behavior based 基于行为Signature based 基于特征Anomaly based 基于异常Heuristic 启发式Protocol analyzers 协议分析仪Spam filter 垃圾邮件过滤UTM security appliances 统一威胁管理URL filter URL过滤Content inspection 内容检查Malware inspection 恶意软件检查Web application firewall vs. network firewallWeb应用防火墙与网络防火墙Application aware devices 应用端设备Firewalls 防火墙IPS 入侵防御IDS 入侵检测Proxies 代理1.2 Given a scenario,use secure network administration principles.给定一个场景,应用安全网络管理原则Rule-based management 基于规则的管理Firewallrules 防火墙规则VLAN management VLAN管理Secure router configuration 安全路由配置Access control lists 访问控制列表Port Security 端口安全802.1x 802.1xFlood guards 流量攻击防护Loop protection 环路保护Implicit deny 默认拒绝Network separation 网络隔离Log analysis 日志分析Unified Threat Management 统一威胁管理1.3 Explain networkdesign elements and components. 解释网络设计的元素和组件DMZ 非军事化区DMZSubnetting 子网VLAN 虚拟局域网NAT 网络地址翻译Remote Access 远程接入Telephony 电话NAC 网络接入控制NACVirtualization 虚拟化Cloud Computing 云计算Platform as a Service 平台即服务Software as a Service 软件即服务Infrastructure as a Service 基础设施即服务Private 私有云Public 公有云Hybrid 混合云Community 社区Layered security / Defense in depth 分层安全/深度防御1.4 Given a scenario,implement common protocols and services. 给定一个场景,实施通用的协议和服务Protocols 协议IPSecSNMPSSHDNSTLSSSLTCP/IPFTPSHTTPSSCPICMPIPv4IPv6Fibre Channel FCoEFTPSFTPTFTPTELNETHTTPNetBIOSPorts 端口21222553801101434433389OSI relevance OSI相关1.5 Given a scenario,troubleshoot security issues related to wireless networking. 给定一个场景,对无线组网中的安全问题进行故障排查WPAWPA2WEPEAPPEAPLEAPMAC filter MAC过滤Disable SSID broadcast 禁用SSID广播TKIPCCMPAntenna PlacementPower level controlsCaptive portalsAntenna typesSite surveysVPN over open wireless2.0 Compliance and Operational Security 合规与运维安全2.1 Explain theimportance of risk related concepts. 解释风险相关概念的重要性Control types 控制类型Technical 技术性Management 管理性Operational 操作性False positives 误报False negatives 漏报Importance of policies in reducing risk 风险降低策略的重要性 Privacy policy 隐私策略Acceptable use 可接受使用Security policy 安全策略Mandatory vacations 强制度假Job rotation 工作轮换Separation of duties 职责分离Least privilege 最小特权Risk calculation 风险计算Likelihood 可能性ALE 年度预期损失Impact 影响SLE 单次预期损失ARO 年度发生率MTTR 平均故障维修时间MTTF 平均失效前时间MTBF 平均故障间隔时间Quantitative vs. qualitative 定量 vs. 定性Vulnerabilities 漏洞Threat vectors 威胁Probability / threat likelihood 可能性/威胁可能性Risk-avoidance, transference, acceptance,mitigation, deterrence 风险规避,转移,接受,降低,威慑Risks associated with Cloud Computing andVirtualization云计算与虚拟化相关的风险Recovery time objective and recovery pointobjective恢复时间目标与恢复点目标2.2 Summarize thesecurity implications of integrating systems and data with third parties. 总结与第三方集成系统与数据的安全含义On-boarding/off-boarding business partners 驻场/场外的业务合作伙伴Social media networks and/or applications 社交媒体网络与应用Interoperability agreements 互操作协议SLA 服务水平协议BPAMOU 备忘录ISAPrivacy considerations 隐私考虑Risk awareness 风险意识Unauthorized data sharing 非授权数据共享Data ownership 数据所有权Data backups 数据备份Follow security policy and procedures 遵从安全策略与程序Review agreement requirements to verifycompliance and performance审核协议需求来确认合规性与性能standards 标准2.3 Given a scenario,implement appropriate risk mitigation strategies. 给定一个场景,实施正确的风险降低策略Change management 变更管理Incident management 事件管理User rights and permissions reviews 用户权限审核Perform routine audits 执行日常审计Enforce policies and procedures to prevent dataloss or theft加强策略和程序来阻止数据的损失或失窃Enforce technology controls 加强技术控制Data Loss Prevention DLP 数据防泄漏DLP2.4 Given a scenario,implement basic forensic procedures.给定一个场景,实施基本的取证程序Order of volatility 波动的顺序Capture system image 获取系统镜像Network traffic and logs 网络流量与日志Capture video 获取视频录像Record time offset 记录时间偏离Take hashes 进行哈希校验Screenshots 截屏Witnesses 目击者Track man hours and expense 跟踪记录人员时间和花费Chain of custody 证据链Big Data analysis 大数据分析2.5 Summarize commonincident response procedures. 总结通用的事件响应程序Preparation 准备Incident identification 事件识别Escalation and notification 升级与通知Mitigation steps 缓解步骤Lessons learned 经验学习Reporting 汇报Recovery/reconstitution procedures 恢复/重建程序First responder 第一响应人Incident isolation 事件隔离Quarantine 隔离区Device removal 设备清除Data breach 数据泄露Damage and loss control 灾害与损失控制2.6 Explain theimportance of security related awareness and training. 解释安全相关意识和培训的重要性Security policy training and procedures 安全策略培训与程序Role-based training 基于角色的培训Personally identifiable information 个人可识别信息Information classification 信息分级High 高Medium 中Low 低Confidential 机密Private 隐私Public 工控Data labeling, handling anddisposal 数据标签、处理与废弃Compliance with laws, best practices andstandards法律、最佳实践与标准的合规User habits 用户习惯Password behaviors 密码行为Data handling 数据处理Clean desk policies 桌面清理策略Prevent tailgating 防止尾随Personally owned devices 个人拥有的设备New threats and new security trends/alerts 新威胁与新安全趋势/警告New viruses 新病毒Phishing attacks 钓鱼攻击Zero-day exploits 零日攻击Use of social networking and P2P 社会工程和P2P的使用Follow up and gather training metrics tovalidate compliance and security 遵从并收集培训度量来验证合规与安全posture 态度2.7 Compare andcontrast physical security and environmental controls.比较和对比物理安全环境控制Environmental controls 环境控制HVAC 空调暖通Fire suppression 灭火EMI shielding 防电磁泄漏Hot and cold aisles 冷热通道Environmental monitoring 环境监控Temperature and humidity controls 温湿度控制Physical security 物理安全Hardware locks 硬件锁Mantraps 陷门双重门Video Surveillance 视频监控Fencing 篱笆Proximity readers 接近探测Access list 访问列表Proper lighting 正确的照明Signs 标记Guards 门卫Barricades 栅栏Biometrics 生物识别Protected distribution cabling 分发保护线缆Alarms 报警Motion detection 活动探测Control types 控制类型Deterrent 威慑性Preventive 预防性Detective 检测性Compensating 补偿性Technical 技术性Administrative 管理性2.8 Summarize riskmanagement best practices.总结风险管理的最佳实践Business continuity concepts 业务连续性概念Business impact analysis 业务影响分析Identification of critical systems and components识别关键系统与组件Removing single points of failure 消除单点故障Business continuity planning and testing 业务连续性规划与测试 Risk assessment 风险评估Continuity of operations 运维连续性Disaster recovery 灾难恢复IT contingency planning IT连续性规划Succession planning 接班人规划High availability 高可用性Redundancy 冗余Tabletop exercises 桌面演练Fault tolerance 容错Hardware 硬件RAID RAID磁盘阵列Clustering 集群Load balancing 负载均衡Servers 服务器Disaster recovery concepts 灾难恢复概念Backup plans/policies 备份计划/策略Backup execution/frequency 备份执行/频率Cold site 冷站Hot site 热站Warm site 温站2.9 Given a scenario,select the appropriate control to meet the goals of security. 给定一个场景,选择合适的控制来满足安全目标Confidentiality 机密性Encryption 加密Access controls 访问控制Steganography 隐写术Integrity 完整性Hashing 哈希Digital signatures 数字签名 Certificates 证书Non-repudiation 抗抵赖Availability 可用性Redundancy 冗余Fault tolerance 容错Patching 补丁Safety 场所安全Fencing 栅栏Lighting 照明Locks 门禁CCTV 闭路电视Escape plans 逃生计划Drills 演练Escape routes 逃生路径Testing controls 测试控制重信息安全管理,对技术的涉及也不太深入,只有Security+认证才是技术人员专属的;贴两章Security+学习大纲你就知道有多牛了,Security+认证一共有六章内容,以下仅仅是2个章节的样例;1.0 Network Security 网络安全1.1 Implementsecurity configuration parameters on network devices and othertechnologies. 在网络设备和其他设备上实施安全配置参数Firewalls 防火墙Routers 路由器Switches 交换机Load Balancers 负载均衡Proxies 代理Web security gateways Web安全网关VPN concentrators VPN网关NIDS and NIPS 网络入侵检测与网络入侵防范Behavior based 基于行为Signature based 基于特征Anomaly based 基于异常Heuristic 启发式Protocol analyzers 协议分析仪Spam filter 垃圾邮件过滤UTM security appliances 统一威胁管理URL filter URL过滤Content inspection 内容检查Malware inspection 恶意软件检查Web application firewall vs. network firewallWeb应用防火墙与网络防火墙Application aware devices 应用端设备Firewalls 防火墙IPS 入侵防御IDS 入侵检测Proxies 代理1.2 Given a scenario,use secure network administration principles. 给定一个场景,应用安全网络管理原则Rule-based management 基于规则的管理Firewallrules 防火墙规则VLAN management VLAN管理Secure router configuration 安全路由配置Access control lists 访问控制列表Port Security 端口安全802.1x 802.1xFlood guards 流量攻击防护Loop protection 环路保护Implicit deny 默认拒绝Network separation 网络隔离Log analysis 日志分析Unified Threat Management 统一威胁管理1.3 Explain networkdesign elements and components. 解释网络设计的元素和组件DMZ 非军事化区DMZSubnetting 子网VLAN 虚拟局域网NAT 网络地址翻译Remote Access 远程接入Telephony 电话NAC 网络接入控制NACVirtualization 虚拟化Cloud Computing 云计算Platform as a Service 平台即服务Software as a Service 软件即服务Infrastructure as a Service 基础设施即服务Private 私有云Public 公有云Hybrid 混合云Community 社区Layered security / Defense in depth 分层安全/深度防御1.4 Given a scenario,implement common protocols and services. 给定一个场景,实施通用的协议和服务Protocols 协议IPSecSNMPSSHDNSTLSSSLTCP/IPFTPSHTTPSSCPICMPIPv4IPv6iSCSIFibre Channel FCoEFTPSFTPTFTPTELNETHTTPNetBIOSPorts 端口212553801101391434433389OSI relevance OSI相关1.5 Given a scenario,troubleshoot security issues related to wireless networking. 给定一个场景,对无线组网中的安全问题进行故障排查WPAWEPEAPPEAPLEAPMAC filter MAC过滤Disable SSID broadcast 禁用SSID广播TKIPCCMPAntenna PlacementPower level controlsCaptive portalsAntenna typesSite surveysVPN over open wireless2.0 Compliance and Operational Security 合规与运维安全2.1 Explain theimportance of risk related concepts.解释风险相关概念的重要性Control types 控制类型Technical 技术性Management 管理性Operational 操作性False positives 误报False negatives 漏报Importance of policies in reducing risk 风险降低策略的重要性 Privacy policy 隐私策略Acceptable use 可接受使用Security policy 安全策略Mandatory vacations 强制度假Job rotation 工作轮换Separation of duties 职责分离Least privilege 最小特权Risk calculation 风险计算Likelihood 可能性ALE 年度预期损失Impact 影响SLE 单次预期损失ARO 年度发生率MTTR 平均故障维修时间MTTF 平均失效前时间MTBF 平均故障间隔时间Quantitative vs. qualitative 定量 vs. 定性Vulnerabilities 漏洞Threat vectors 威胁Probability / threat likelihood 可能性/威胁可能性Risk-avoidance, transference, acceptance,mitigation, deterrence风险规避,转移,接受,降低,威慑Risks associated with Cloud Computing andVirtualization云计算与虚拟化相关的风险Recovery time objective and recovery pointobjective恢复时间目标与恢复点目标2.2 Summarize thesecurity implications of integrating systems and data with third parties. 总结与第三方集成系统与数据的安全含义On-boarding/off-boarding business partners 驻场/场外的业务合作伙伴Social media networks and/or applications 社交媒体网络与应用Interoperability agreements 互操作协议SLA 服务水平协议BPAMOU 备忘录ISAPrivacy considerations 隐私考虑Risk awareness 风险意识Unauthorized data sharing 非授权数据共享Data ownership 数据所有权Data backups 数据备份Follow security policy and procedures 遵从安全策略与程序Review agreement requirements to verifycompliance and performance审核协议需求来确认合规性与性能standards 标准2.3 Given a scenario,implement appropriate risk mitigation strategies. 给定一个场景,实施正确的风险降低策略Change management 变更管理Incident management 事件管理User rights and permissions reviews 用户权限审核Perform routine audits 执行日常审计Enforce policies and procedures to prevent dataloss or theft加强策略和程序来阻止数据的损失或失窃Enforce technology controls 加强技术控制Data Loss Prevention DLP 数据防泄漏DLP2.4 Given a scenario,implement basic forensic procedures. 给定一个场景,实施基本的取证程序Order of volatility 波动的顺序Capture system image 获取系统镜像Network traffic and logs 网络流量与日志Capture video 获取视频录像Record time offset 记录时间偏离Take hashes 进行哈希校验Screenshots 截屏Witnesses 目击者Track man hours and expense 跟踪记录人员时间和花费Chain of custody 证据链Big Data analysis 大数据分析2.5 Summarize commonincident response procedures. 总结通用的事件响应程序Preparation 准备Incident identification 事件识别Escalation and notification 升级与通知Mitigation steps 缓解步骤Lessons learned 经验学习Reporting 汇报Recovery/reconstitution procedures 恢复/重建程序First responder 第一响应人Incident isolation 事件隔离Quarantine 隔离区Device removal 设备清除Data breach 数据泄露Damage and loss control 灾害与损失控制2.6 Explain theimportance of security related awareness and training. 解释安全相关意识和培训的重要性Security policy training and procedures 安全策略培训与程序Role-based training 基于角色的培训Personally identifiable information 个人可识别信息Information classification 信息分级High 高Medium 中Low 低Confidential 机密Private 隐私Public 工控Data labeling, handling anddisposal 数据标签、处理与废弃Compliance with laws, best practices andstandards法律、最佳实践与标准的合规User habits 用户习惯Password behaviors 密码行为Data handling 数据处理Clean desk policies 桌面清理策略Prevent tailgating 防止尾随Personally owned devices 个人拥有的设备New threats and new security trends/alerts 新威胁与新安全趋势/警告New viruses 新病毒Phishing attacks 钓鱼攻击Zero-day exploits 零日攻击Use of social networking and P2P 社会工程和P2P的使用Follow up and gather training metrics tovalidate compliance and security 遵从并收集培训度量来验证合规与安全posture 态度2.7 Compare andcontrast physical security and environmental controls.比较和对比物理安全环境控制Environmental controls 环境控制HVAC 空调暖通Fire suppression 灭火EMI shielding 防电磁泄漏Hot and cold aisles 冷热通道Environmental monitoring 环境监控Temperature and humidity controls 温湿度控制Physical security 物理安全Hardware locks 硬件锁Mantraps 陷门双重门Video Surveillance 视频监控Fencing 篱笆Proximity readers 接近探测Access list 访问列表Proper lighting 正确的照明Signs 标记Guards 门卫Barricades 栅栏Biometrics 生物识别Protected distribution cabling 分发保护线缆 Alarms 报警Motion detection 活动探测Control types 控制类型Deterrent 威慑性Preventive 预防性Detective 检测性Compensating 补偿性Technical 技术性Administrative 管理性2.8 Summarize riskmanagement best practices.总结风险管理的最佳实践Business continuity concepts 业务连续性概念Business impact analysis 业务影响分析Identification of critical systems and components识别关键系统与组件Removing single points of failure 消除单点故障Business continuity planning and testing 业务连续性规划与测试 Risk assessment 风险评估Continuity of operations 运维连续性Disaster recovery 灾难恢复IT contingency planning IT连续性规划Succession planning 接班人规划High availability 高可用性Redundancy 冗余Tabletop exercises 桌面演练Fault tolerance 容错Hardware 硬件RAID RAID磁盘阵列Clustering 集群Load balancing 负载均衡Servers 服务器Disaster recovery concepts 灾难恢复概念Backup plans/policies 备份计划/策略Backup execution/frequency 备份执行/频率Cold site 冷站Hot site 热站Warm site 温站2.9 Given a scenario,select the appropriate control to meet the goals of security. 给定一个场景,选择合适的控制来满足安全目标Confidentiality 机密性Encryption 加密Access controls 访问控制Steganography 隐写术Integrity 完整性Hashing 哈希Digital signatures 数字签名 Certificates 证书Non-repudiation 抗抵赖Availability 可用性Redundancy 冗余Fault tolerance 容错Patching 补丁Safety 场所安全Fencing 栅栏Lighting 照明Locks 门禁CCTV 闭路电视Escape plans 逃生计划Drills 演练Escape routes 逃生路径Testing controls 测试控制。
网络安全(英语版)ppt课件
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网络安全威胁
网络基本拓扑结构有3种：星型、总线型和环型。在建造内部网时，
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Maintain Network Security
Recently, the news that U.S attack on Chinese Internet is exposed. In the era of rapid development of network, we must take measures to protect our security of privacy and property effectively. we need to distinguish right from lots of websites. Furthermore, it is inevitable that some secure anti-virus soft wares can be installed.
渗入威胁
植入威胁
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wireshark104报文解析
wireshark104报文解析Wireshark is a widely-used network protocol analyzer that allows users to capture and analyze network traffic in real-time. In this article, we will delve into the intricacies of Wireshark's capabilities and explore its features for in-depth packet analysis.Wireshark104: Understanding Packet Analysis with WiresharkPacket analysis is a crucial aspect of network troubleshooting and performance optimization. Wireshark provides a comprehensive set of tools that help network administrators and security professionals decode and analyze network packets. Let's explore some key features and techniques in Wireshark for effective packet analysis.1. Capturing Packets:Wireshark allows users to capture packets from different network interfaces, including Ethernet, wireless, and virtual interfaces. By selecting the appropriate interface, Wireshark can capture all incoming and outgoing packets on the network. This data can be useful for analyzing network behavior, identifying potential bottlenecks, and detecting suspicious activities.2. Filtering Packets:Wireshark provides powerful filtering options to focus on specific packets of interest. Users can define filters based on source or destination IP addresses, port numbers, protocols, or even specific packet content. This feature helps in narrowing down the packet capture to relevant data and simplifying the analysis process.3. Packet Decoding and Analysis:Once packets are captured, Wireshark decodes each packet based on its corresponding protocol. Wireshark supports a wide range of protocols, including popular ones like TCP/IP, HTTP, DNS, and SSL/TLS. Users can view the decoded information in a human-readable format, allowing for easy interpretation and analysis.4. Statistics and Graphs:Wireshark offers various statistical tools and graphs to visualize network traffic patterns. Users can generate graphs depicting packet rates, response times, and traffic patterns, which can aid in identifying network anomalies and unusual behavior. These statistics provide valuable insights into network performance and can help troubleshoot issues efficiently.5. Follow Stream:Wireshark's "Follow Stream" feature enables users to view the entire communication between two endpoints. Whether it's a web page request/response, email conversation, or file transfer, this feature consolidates related packets and presents them in a sequential manner. It simplifies the analysis of complex network protocols and enhances the understanding of network interactions.6. Exporting and Sharing Results:Wireshark allows users to export packets or analysis results in various formats, including plain text, CSV, or XML. This feature is particularly useful for sharing analysis findings with team members or incorporating the data into other network analysis tools.In conclusion, Wireshark is a powerful tool for packet analysis, offering a myriad of features that aid in network troubleshooting, performance optimization, and security analysis. By utilizing Wireshark effectively, network administrators and security professionals can gain deeper insights into network behavior and resolve network issues efficiently.。
网络安全巡检流程
网络安全巡检流程Network security inspection is a crucial process in ensuring the protection of data and information in an organization. 网络安全巡检是确保组织数据和信息安全保护的关键过程。
Conducting regular inspections helps to identify vulnerabilities, mitigate risks, and prevent potential cyber threats. 定期进行巡检有助于识别漏洞，减轻风险，预防潜在的网络威胁。
It is essential for businesses to establish a comprehensive security inspection plan to safeguard their network infrastructure. 对企业来说，建立全面的安全巡检计划以保护其网络基础设施至关重要。
By following best practices and leveraging the right tools, organizations can enhance their security posture and stay ahead of cybercriminals. 通过遵循最佳实践并利用合适的工具，组织可以增强其安全姿态并保持领先地位，远超网络犯罪分子。
One of the first steps in the network security inspection process is to conduct a thorough assessment of the organization's current security measures. 网络安全巡检流程中的第一步是对组织当前的安全措施进行全面评估。
网络安全威胁
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IP
攻击
Network Protocols & Network Security 《 网 络 协 议 与 网 络 安 全 》 凌 力
ICMP
IP
11
Network Protocols & Network Security 《 网 络 协 议 与 网 络 安 全 》 凌 力
UDP Flood
监听 通信 通信
网络
5
Network Protocols & Network Security 《 网 络 协 议 与 网 络 安 全 》 凌 力
漏洞扫描
扫描网络互连设备
– 路由器、防火墙、接入服务器等，以及品牌、型号、功能配置等
接入设备扫描
– 探寻未加安全防范的调制解调器
端口扫描（Port Scanning） 端口扫描（ ）
执行程序
有权限
程
高
用户
用户权限 目标
18
一
Network Protocols & Network Security 《 网 络 协 议 与 网 络 安 全 》 凌 力
Shell溢出攻击实例－准备 溢出攻击实例－
#include <unistd.h> void main(){ char *name[2]; name[0] = "/bin/sh"; name[1] = NULL; execve(name[0],name,NULL); exit(0); }
C源程序：输出什么？ void main( ) { int x; x = 0; pass(1, 2, 3); x = 1; printf("%d",x); } int pass(int a, int b, int c) { char buffer[16]; int sum; int *ret; ret = buffer + 20; (*ret) += 10; sum = a + b + c; return sum; } 汇编
网络安全服务部英文
网络安全服务部英文The Network Security Services Department is a crucial department within our organization that focuses on protecting the integrity and confidentiality of our network and data. Our team of highly skilled professionals is dedicated to implementing and managing various security measures to ensure the safety of our network and prevent any unauthorized access or attacks. Our department provides the following services:1. Firewall Management: We deploy and manage firewalls to safeguard our network from unauthorized access and malicious activities. We regularly update the firewall configurations to adapt to evolving threats and ensure the highest level of protection.2. Intrusion Detection and Prevention: Our team monitors network traffic to detect any suspicious activities and alerts in real-time. We employ advanced intrusion detection and prevention systems to mitigate potential threats and prevent unauthorized access to our network.3. Vulnerability Management: We regularly perform vulnerability assessments and penetration testing to identify and address security weaknesses in our network. Our team works closely with system administrators to remediate vulnerabilities and enhance the overall security infrastructure.4. Security Incident Response: In the event of a security incident or breach, our team works promptly to investigate and contain the incident. We follow industry standard incident response procedures to minimize the impact and recover any compromised systems ordata.5. User Awareness and Training: We believe that user awareness is critical for maintaining network security. We conduct regular training sessions to educate our employees on best practices, such as recognizing phishing emails, using strong passwords, and safely browsing the internet. We also provide security awareness materials and resources to help employees stay vigilant and informed.6. Network Monitoring and Analysis: We continuously monitor network traffic, logs, and security events to identify any abnormal activities or potential threats. Our team analyzes the data to detect patterns, track trends, and proactively respond to emerging security risks.7. Security Policy Development and Compliance: We work with other departments to develop and enforce security policies that align with industry best practices and regulatory requirements. We also conduct regular audits to ensure compliance and enforce policies to maintain the security posture of our network.8. Data Encryption: We implement encryption technologies to protect sensitive data during transmission and storage. Our team ensures the proper implementation and management of encryption protocols to safeguard confidential information.By availing our network security services, you can have peace of mind knowing that your network and data are in capable hands. Our team is dedicated to maintaining the highest standards ofsecurity and will work tirelessly to protect your organization from cyber threats.。
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Run of a protocol
Initiate A Respond Attacker B
C D
Correct if no security violation in any run
Protocol analysis methods
Cryptographic reductions
Bellare-Rogaway, Shoup, many others UC [Canetti et al], Simulatability [BPW] Prob poly-time process calculus [LMRST…] Model checking
Security Analysis of Network Protocols
John Mitchell Stanford University
Usenix Security Symposium, 2008
Many Protocols
Authentication anros, IKE, JFK, IKEv2, Mobile IP, WEP, 802.11i Contract signing, SET, electronic cash, … Web services, …
C
Cert C, [t C, n 2]skC , C, T, n 1
(basic idea)
I I
Cert I, [t C, n 2]skI, I, T, n 1
K
I C
{[k, n 2]skK}pkC , C, TGT, {AK, …}k
{[k, n 2]skK}pkI, I, TGT, {AK, …}k Data signed by KDC does not include name of client
Home Agent (HA)
Authentication is a requirement Early proposals weak
802.11i Wireless Authentication
Supplicant UnAuth/UnAssoc Auth/Assoc 802.1X UnBlocked Blocked No Key PTK/GTK 802.11 Association EAP/802.1X/RADIUS Authentication MSK 4-Way Handshake Group Key Handshake Data Communication
Break messages into parts Encrypt, decrypt, sign only if it has the key
Adversary
Example: 〈K1, Encrypt(K1, “hi”) 〉 fi K1, Encrypt(K1, “hi”) fi “hi”
Client
TGS-REP
TGS
AP-REQ
Client
AP-REP
Server
Used for network authentication
Microsoft Security Bulletin MS05-042
Vulnerabilities in Kerberos Could Allow Denial of Service, Information Disclosure, and Spoofing (899587)
Protocol Attacks
Kerberos [Scederov et. Al.]
Public key version - lack of identity in message causes authentication failure Lack of authentication in msg causes dos vulnerability Proved correct using PCL [ Datta , Derek, Sundararajan] Authorization failure Version roll-back attack, authenticator confusion between main and resumption protocol We will look at this today
All methods use some simplifying assumptions Diversity and overlap of methods is a good thing
Develop basic science and engineering
New protocols are being developed Methods can be used for other systems
TLS protocol layer over TCP/IP
http telnet Application SSL/TLS Transport
(TCP)
ftp nntp
Internet (IP) Network interface Physical layer
IKE subprotocol from IPSEC
Send messages derivable from stored parts
Many formulations
Word problems [Dolev-Yao, Dolev-Even-Karp, …]
Protocol step is symbolic function from input message to output Protocol step is symbolic function from state and input message to state and output message Each protocol step can be defined by logical clauses Resolution used to perform reachability search Write set constraints defining messages known at step i Partial order (Lamport causality), reasoning methods Each protocol step is process that reads, writes on channel Spi-calculus: use ν for new values, private channels, simulate crypto
Wireless and mobile computing
Electronic commerce
And more
Mobile IPv6 Architecture
Mobile Node (MN)
IPv6
Direct connection via binding update
Corresponding Node (CN)
FDR [Lowe, Roscoe, …], Murphi [M, Shmatikov, …], …
Symbolic methods
Symbolic search
NRL protocol analyzer [Meadows], …
Theorem proving
Isabelle [Paulson …], Specialized logics [BAN, …]
K
C
{[k, n 2]skK}pkC , C, TGT, {AK, …}k
Main points of this talk
Widely used protocols central to security
Worth designing correctly Worth analyzing for bugs Worth proving them correct
Protocol analysis spectrum
High
Hand proofs
Modeling detail
Poly-time calculus Multiset rewriting with ∃ Spi-calculus Paulson Athena NRL Strand spaces BAN logic
Attack found in PKINIT-25; fixed in PKINIT-27 Used in Windows and Linux (called Heimdal) Also in implementation by CableLabs (for cable boxes)