Design And Implementation Of The Anonymous Instant Messaging System Based On Android

With the development of Internet and intelligent terminal technology, mobile phone configuration upgrading quickly, people in their daily lives more and more depending on mobile phones, a lot of traditional communication ways have gradually turned into the form of electronic communication. Many kinds of mobile interactive software aroused at the historic moment, such as MSN, QQ, Weixin and Momo. At present network security research mainly focused on how to ensure the information in each communication on the Internet being not found by others. But it only realized the safety of the communication data, and ignored an important question: if the encrypted data can be followed, it would lead to the identities of both sides of communication and thier sensitive personal privacy leak.The Public Key Infrastructure is a kind of public key management which supports authentication, encryption, integrity and accountability service.It has a unified standard for the international.Is mainly used in the high security requirements of network service.The Privilege Management Infrastructure comes from the Public Key Infrastructure.It issues the third party property certificate to the users.The third party property certificate binds the identity of property holders with their attributes.It makes the service provider has the ability to know whether the user has access authority.With the help of the third party property certificate PKI/PMI system can supports the function of anonymous authentication.The anonymous authentication mechanism based on this system has become the new way to protect the user’s personal information.We put forward a real-time anonymous chat system based on Android. In order to protect the personal information of users,we put forward an improved anonymous authentication mechanism based on PKI/PMI certificate to achieve the anonymous login,and improved the efficiency of this mechanism.At the same time,this system mainly implements sending and receiving messages, group discussion, friends list management,and other basic functions, such as the management of group and good friends’ list. The main application technologies in this system include multi-threaded concurrent control, message communication based on TCP/IP protocol, the unified data access interface, etc. In this paper, the main works are:(1) Collecting and analyzing the users’ needs, designing the structure and functions of the instant anonymous chat system.(2) Using an anonymous authentication mechanism based on PKI/PMI certificate to protect the user’s personal information.(3) Depend on the system data requirements of running process, using the data access interfaces to provide a complete data access service for the whole chat system.(4) Based on the users’ demands for anonymous friends talk in a same group, researching and designing functions of creating group chat room, sending and receiving data, background message receiving and other functions.The anonymous instant messaging chat system based on Android platform provides good service for the users, it runs well in actual operation environment, and completed the scheduled targets. The system meets the needs of users’ anonymous group chat function.