Algorithm Design of Secure Data Message Transmission Based on Openssl and Vpn

In order to solve the safety problem that remote or mobile users can perform secure data transmission among different computers via enterprise internal network, conventional approach is to establish VPN connection. The transmitted data via VPN network must be encrypted so as to ensure that illegal users are unable to read them, therefore data security of VPN network depends entirely on the strength of the adopted encryption algorithm. In this paper we propose a secure data transmission algorithm based on OpenSSL and VPN. It combines both the characteristics of asymmetric password system and symmetric crypto-system, and provides a good and fast way for the safety of information transmission. On the whole, the algorithm has such advantages as simple principle, higher security, and so on. Meanwhile it is more convenient to be implemented by hardware and software, better meeting design criteria of encryption algorithm. Besides, our practice in water conservancy practice shows that the adoption of this algorithm can well realize fast and secure information transmission.