Research And Implementation Of Security Communication Protocol Of Security Access System

External terminal security access is important content of research on network information protection. Security access system ensures information security of private network through some measures which include data encryption, identity authentication, review and filter the private network data. Security communication protocol is the core content of the security access system, it is a very important work that research security protocol deeply.Currently, the common security communication protocol including the IPSec protocol, the SET protocol and the SSL protocol. These protocols have different advantages and disadvantages and scope of applications. SSL protocol is transparent to application layer and can implement end-to-end communication security, so security access system choose the SSL protocol as the object of further research generally. SSL protocol has been considered to be safe and reliable, however, recent domestic and abroad research find SSL protocol exist some security problems.This paper first introduces overview of security communication protocols and make a comparison of three protocols which include IPSec, SET and SSL. Then make a detailed analysis of SSL protocol structure and handshake message process, merged with in-depth study of its security. On this basis, put forward SSL improvement schemes and achieve it. And as this basis to design and innovate the security access communication module. Communication module covers:client and server, data confidentially, identity authentication three aspects.