Design And Application Of Data Encrytion In Mobile Value-Added Services

With the development of mobile communication technology, mobile Value-Added Sevices (VAS) not only brings great profit to the mobile service providers, but also has enriched the service pattern and becomes the new growth direction of mobile network besides original voice services. However, the development of mobile VAS also encountered some problems. Mobile network's own security issues for mobile VAS is becoming a threat to internal security, and the diversity of mobile VAS have also decided that a variety of business security needs has a lot of difference, therefore, study for the security of mobile VAS system is inevitable.In this article, the communication security of mobile VAS system was selected as a research subject. From its both communication channels which contain Short Message Service and GPRS, it utilized all mature symmetric and asymmetric encryption algorithms, and designed secure and authenticated all-purpose transmission protocol, then developed a typical application.The security algorithm (as far as possible to prevent all attacks), security communications (secret information, anti-tampering, anti-counterfeiting and anti-denying, etc.) was the research focus. The limited communication environment was also considered. The article attempted to design a common and extensible light safe communication protocol, including digital certificate and encryption information format design. At last, with this common protocol, ANXITONG VAS system was designed.This article also provides important reference value for the design of other VAS's secure protocols.