毕业设计安全网络即时通信软件的设计与实现.doc

【毕业设计】安全网络即时通信软件的设计与实现 年 月 日 摘 要 随着计算机网络技术突飞猛进的发展即时通信已成为目前互联网上最为流行的通信方式深受广大网民的喜爱无论是国内的腾讯还是微软的MSN Messenger都拥有相当大的用户群即时通信软件给人们带来了极大的便利使人们可以随时随地地和亲朋好友进行在线交流和沟通它拉近了人与人之间的距离丰富了人们的精神生活正逐渐成为人们生活和工作中不可或缺的一部分 虽然即时通信软件层出不穷但是大部分免费的即时通信软件都缺少数据加密功能存在着不容忽视的网络安全隐患本课题将利用现有的网络通信技术数据库技术和信息安全技术设计并实现一个新的安全网络即时通信系统它在原有的即时通信系统的基础上使用DES加密算法对通信内容进行加密和解密保证了数据通信的及时性和安全性为人们提供了更加安全可靠的即时通信平台 本系统采用三层CS和P2P通信模型混合结构设计系统构架在NET开发环境下使用C语言进行开发数据库采用了SQL Server 2000该即时通信软件具备的主要功能包括用户帐号申请用户登录添加好友文字聊天文件传输等本系统使用便捷用户界面人性化安全保密设置齐全 关键词即时通信信息安全DES算法便捷 ABSTRACT Along with the fast development of the computer networking technology instant communication has become the most popular communication means on the Internet and it is favored by the majority of Internet users Whether domestic tencent or Microsofts MSN Messenger has considerable user group Instant communication software has brought people great convenience that people can communicate with relatives and friends online whenever and wherever possible It cuts down the distance between people and people and enrich peoples spiritual life and it is becoming an indispensable part of peoples life and work Although instant communication software emerges endlessly but most free instant communication software lacks data encryption functions so that it exists the networking danger hidden which cant be ignored This subject will use the existing network communication technology database technology and information security technology to design and implement a new safety networking instant communication system Basing itself on the old instant communication system it uses DES encryption algorithm to encrypt and decrypt the communication content to ensure timeliness and security of the data communication so that it provides people with a more secure and reliable instant communication platform The system uses the three-layer CS and P2P communication model composite structure to design system architecture and use C language to develop