Research And Implementation Of Key Technology On Wi-Fi Secure Access For Android Mobile Terminals

Wi-Fi hotspots provide mobile users with rapid and convenient network access service. Meanwhile, they are easy to be illegally utilized as tools of cyber crimes to steal users’ personal accounts and private datum by hackers. In order to guarantee mobile users’ secure access to Internet in untrusted wireless network environments, this paper researches on technology of Mobile Virtual Private Network(MVPN) and improves its shortage on transmission speed and connection stability to better cater for mobile terminals.First of all, virtual tunnel technology of MVPN is researched with presenting its taxonomy criterions, basic principles, evaluations and application scenarios. By studing the establishment and working way of tunnels on Android platform, simple tunnel MVPN is implemented. Functional test results show that the tunnel is able to receive and transmit all the mobile traffic without limiting network access speed.To enhance the security of virtual tunnels, this paper studies on secure communication protocols of MVPN. The shortages of existing MVPN protocols are analyzed and fast transmission tunnel protocol is raised based on the design concept of Open VPN’s protocol. Handshake stage and transmission stage of this protocol are implemented hierarchically for simplifying the complexity of tunnel protocols and improving the transmission efficiency of communication tunnels. Performance test results verify fast transmission MVPN implmented with the proposed protocol has faster transmission speed and lower transmission delay than Open VPN. It can ensure secure communication of virtual tunnels as well.To improve the stability of secure tunnels, this paper researches on the stability of MVPN connections. Our study clarifies the underlying reasons for insufficient stability of existing MVPN applications and proposes a generic communication supportable mechanism for MVPN. The basic principle of this mechanism is abstracted in formal languages and its mathematical models are constructed with Finite State Machine models. Then, a communication supportable model of MVPN is put forward in view of the mechanism above and communication suppotable MVPN is implemented as a prototype of this model. Stability test results prove the stability of communication supportable MVPN reaches 96.67%. Meanwhile, the communication supportable model is superior in its generality and scalability.Finally, this paper combines the secure, fast and stable MVPN implemented above with application scenarios of Wi-Fi secure access to design Wi-Fi secure access system for Android mobile terminals. System test results testify that the system functions can meet the requirements of Wi-Fi secure access on mobile terminals and the system performance appeals to our expectation. However, the power consumption is to be optimized further.