计算机加密系统的设计与实现

摘要

随着计算机技术的提高，网络安全也就成为当今网络的焦点中的焦点，几乎没有人不在谈论网络上的安全，病毒、黑客程序、邮件炸弹、远程侦听等这一切都无不让人胆战心惊。病毒、黑客的猖獗使身处今日网络社会的人们感觉到谈网色变，无所适从。

但我们必需清楚地认识到，这一切一切的安全问题我们不可一下全部找到解决方案，况且有的是根本无法找到彻底的解决方案，如病毒程序，因为任何反病毒程序都只能在新病毒发现之后才能开发出来，还没有哪能一家反病毒软件开发商敢承诺他们的软件能查杀所有已知的和未知的病毒，所以我们不能有等网络安全了再上网的念头，因为或许网络不能有这么一日，就象“矛”与“盾”，网络与病毒、黑客永远是一对共存体。

电脑加密技术就是适应了网络安全的需要而应运产生的，它为我们进行一般的商务活动提供了安全保障，如在网络中进行文件传输、电子邮件往来和进行合同文本的签署等。其实加密技术也不是什么新生事物，只不过在当今电子商务、电脑网络中还是近几年的。下面我们就详细介绍一下加密技术的方方面面，希望能为那些对加密技术还一知半解的朋友提供一个详细了解的机会！

关键词：文件加密、密钥

ABSTRACT

With the improvement of computer technology, network security has become the focus of the current focus of the network, almost no one does not talk about network security, virus, hacker programs, mail bombs, remote listening, etc. All these are all scary. Viruses, hackers rampant that people living today feel about the network of social networks pale and disoriented.

But we must clearly recognize that all these security problems we can not look at all find a solution, Moreover, some simply can not find a complete solution, such as virus program, because any anti-virus programs can only be discovered only after the new virus Developed, there is no anti-virus software developers, how can a commitment to their software dare to killing all known and unknown viruses, we can not have safe access to internet and other network idea, because the network may not have such a Day, as "spear"and"shield ", the network with viruses, hackers will always be a body of coexistence.

Computer encryption technology is adapted to the needs of network security have to be shipped, and it is our business to provide general security, such as network file transfers, e-mail contacts and the signing of the contract documents and so on. In fact, encryption is not a new phenomenon, but in today's e-commerce, computer network or in recent years. Below we explain in detail all aspects of encryption technology, hoping for those little knowledge of encryption technology also provides a detailed understanding of friends the chance!

Keywords: Encryption Security

目录

1、加密的由来 ...................................... - 4 -

2、加密的概念 ...................................... - 4 -

3、加密的理由 ...................................... - 4 -

4、两种加密方法 .................................... - 6 -

5、加密技术中的摘要函数（MAD、MAD和MAD）........... - 6 -

6、密钥的管理 ...................................... - 7 -6.1、密钥的使用要注意时效和次数 .................... - 7 -

6.2、多密钥的管理 .................................. - 7 -

7、数据加密的标准 .................................. - 8 -

8、加密技术的 ...................................... - 9 -8.1、在电子商务方面的应用 ......................... - 10 -8.2、加密技术在VPN中的应用 ....................... - 10 -参考文献 .......................................... - 12 -