The design of VPN security gateway in remote monitoring system of rheometer

On the basis of Internet communication, this paper puts forward a kind of combination virtual private network VPN technology equipment remote monitoring solutions. In remote client build Server services and use SSL technology and VPN technology build C/S mode network structure, and control access permissions, protect data security transfer. Expound the general structure design of the VPN security gateway. In SSL VPN use a series of cryptogram knowledge related, including symmetric encryption, asymmetric encryption, digital signatures, digital certificates and message digest,this paper careful analysis the principles of relevant cryptogram technology, and the application of direction, and combine them, not only protect the safety but also enhanced the performance of the system. Experiments show that the VPN Gateway enhances the ability that VPN client securely and credibly accesses the protected network. Demonstrate the effectiveness and safety of the design.