毕业设计论文－基于C的文档加密器设计与实现含代码.doc

基于C#的文档加密器设计与实现 【】【】DESC#；文件加密；文件解密 The Implementation of a Document Encrypter Based on C# Abstract: With the rapid development of the computer and communication technologies， large mount of sensitive information are exchanged on the public communications facilities or computer networks. Especially under the situation of the widespread of the Internet applications， such as E-commerce and E-government， more and more information， such as bank account numbers， personal privacy， need to be encrypted. Such requirement for the secrecy and authenticity makes it necessary to develop an encrypter to encrypt the sensitive information. This system， developed with ASP.NET (C #)， primarily includes such functions as setting the password of the document to be encrypted， encrypting the document， verifying the decryption password and decrypting the document. What needs to expand include encrypting and decrypting the network data or data on hosts; packaging data on the Internet and implementing encrypted transmission; replacing partial text in encrypted document. Besides， keys need to be transmitted on the safety channel because key management is the critical safety factor of the entire document. Users can protect their important data and prevent the unauthenticated persons from stealing the information by using the entrypter. Encryption is the key means to protect the important information， and decryption is to restore the encrypted data to make it readable. Keywords: The DES encrypter; C#; Document encryption; the Document decryptio 目 录 引 言 1 1 绪论 ………………2 1.1国内外研究现状…………………………………………………………………2 1.1.1 公钥密码………………………………………………………………………...2 1.1.2 分组密码…………………………………………………………………………2 1.1.3 数字签名………………………………………….……………………………..3 1.2 课题研究意义…………………………………………………………………………..4 1.3 课题研究方法…………………………………………….…...……………….……….4 2 系统开发环境及设计相关技术介绍 4 2.1 DES 算法 4 2.2 算法比较 4 2.3 C# 介绍 5 2.4 Visual Studio…………………………………………………………………………5 3 系统分析 6 3.1 可行性分析 6 3.2 需求分析 6 3.2.1 主要需求 6 3.