The Design And Implementation Of Dynamic Vpn Client Based On Usb

With the development of 3G, mobile office is a part of the life to people, the security of which is becoming more and more important.The paper made a research on the technology of identification, vpn, access control and embedded Linux deeply. We designed a dynamic secure vpn system based on mobile storage media. The main work of the paper is as follows:1. Analyzed and Studied vpn technology deeply. Pointed out the smallest protocol sets of IPsec, which provided the basis of protocol for the development of system.2. Studied embedded Linux technology. Put forward the file tailor method based on busybox and tinylogin, which includes one custom-made and four stages. And installed tailored linux on mobile storage media.3. Put forward dynamic secure vpn system, which satisfy mobile office demands. Put forward the protocol of dynamic access and authentication and dynamic secure association protocol, which can construct dynamic virtual private network and solved the problems of dynamic IP access and access control of user.4. Designed dynamic vpn client based on mobile storage media, which include identification, secure tunnel establishment and secure transmission. At the same time, put forward a project of the compatibility of ipsec and Nat, which make the construct of vpn more flexible and more convenient.