古典密码的综合运用

古

龚雪莲

数学系数学与应用数学专业二零零五级指导教师：李滨

摘要：随着计算机和通信技术的飞速发展，密码学已经渗透到了政治、经济、文化乃至个人隐私等领域，使用加密技术来保护信息的安全变得越来越重要。这篇论文的重点是介绍几个古典密码体制、古典密码加密解密及其用几种密码体制合成的密码体制的加密和解密。

论文主要分为两大部分,理论部分和应用部分。理论基础部分包括正文的“1概述”和“2 几种密码体制的原理及加解密算法的描述”：“1概述”简单介绍了密码学和几种古典密码的基础知识；“2 几种密码体制的原理及加解密算法的描述”较详细地介绍了几种古典密码加密算法的叙述和解密。应用部分为“3密码体制的综合运用”：“3密码体制的综合运用”包括几种密码的加密解密的运算过程及结果。

这篇论文通过对加密算法的运用为密码学中加密算法在几种密码体制的综合下的运用及其密码的安全系数。

关键词：密码学，密码体制，加密算法，解密算法，密钥,明文，密文。

The comprehensive use of classical password

Gong Xuelian

Department of mathematics in mathematics and applied mathematics specialized 2005 Grade Instructor:Li Bin

Abstract：Along with the computer and the communication technology rapid development, the cryptology already seeped domain and so on politics, economy, culture and even individual privacy, the use encryption technology protects the information the security to change more and more importantly. This paper key point is introduced several classical passwords systems, the classical password encryption decipher and cipher system's encryption which and decipher synthesizes with several kind of cipher systems.

The paper mainly divides into two major parts, the theory part and the application part. The rationale partially "1 outline" and "2 several kind of passwords systems principle and adds the decipher algorithm including the main text the description": "1 outline" simply introduced several kind of classical passwords elementary knowledges; "2 several kind of passwords systems principle and added the decipher algorithm the description" in detail to introduce several kind of classical passwords encryption algorithm narration and the decipher, but algorithm content prepared for the fourth chapter of algorithm using the content. Applies the part is "3 cipher system's synthesis utilization": "3 cipher system's synthesis utilization " including several kind of password encryption decipher operation process and result.

This paper through to encryption algorithm utilization for cryptology in encryption algorithm under several kind of cipher system's synthesis utilization and password safety coefficient.

Key words：cryptology ;password system ; encrypting algorithm ;deciphering algorithm ; key ; state in writing ; cryptograph .

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密码可以说是组成现代生活以及科学领域的重要组成部分，密码从开始的战争中的信息的传递到现在文字、图片、视频等的传递都需要进行加密，才能保证这些东西的安全性。早在400多年前，《破译者》一书中所说“人类使用密码的历史几乎与使用文字的时间一样长”。政治要人接收的邮件都进行双向加密，一个用于加密一个用于解密，但绝对不会用同一个密码体制进行加解密。现在我们国家开始实行数字电视，其中有些电视台是进行加密了的，必须获得许可才可以用，实行收费制。现在在网上聊天用的聊天工具，也是安装了密保的，如果你担心你的聊天记录被人看，你就可以多设几道防线及设密码。还有，经济方面、国防等等这些都是设立了密码