| With the development of mobile access IP networks and popularization of mobile phone, securing information exchange between mobile network and IP networks has become hotspot. People need to use mobile phone or PDA to securely access business system everywhere to meet the requirement of the business system. This dissertation studies the security issues when mobile phone access business system, and integrates the mobile IPSec VPN terminal system base on analyzing of the risk in the mobile network environment. The following are mainly work involved:1. Designs the strategy for security issues when mobile terminals accessing fixed networks from GPRS CDMA or 802.11 networks.2. Integrates the mobile IPSec VPN terminal system. This system supports SDIO smart card which stores the user's certificate.3. Tests the prototype of mobile IPSec VPN terminal system in experimental and real environments. The result shows that the technology using in prototype is feasible. |