即时消息协议及其系统的分析

IM(Instant Messager) communication has seen enormous grouth over the last several years and has become one of the most important means of communication. However, IM service providers kept their own protocols private to prevent their users from leaving. In the absence of uniform standards is widely recognized cause of users from different IMs can hardly communicate. Therefore, research on generality of IM protocol has become an inevitable trend. By monitoring these IM network traffics, this analysis discribs system architecture, data format, user authentication and other available features of the three most popular network IM protocols: Tencent QQ, Fetion and MSN. In addition, advantages and disadvantages among the three IMs will be discussed as much as possible.