| Along with the widespread application of VoIP technology, its security problems are increasingly serious. At present, the security has become one of the important targets of the VoIP system performance evaluationsThis article first analyzed the present VoIP security problem as a whole, key to the traditional lamination security technologies, such as TLS protocol, the Ip Security protocol and the SSH protocol. The paper take the cryptology security theory as a foundation, has studied VoIP thoroughly the safe key technologies TLS protocol, unifies the InstLink system the construction, analysis this system security requirements of InstLink system . In view of the fact that the XMPP protocol has the fine security construction, this article has carried on the expansion based on the trust network connection to it, has established the InstLink system server end and the client side security construction model. The paper finally has carried on the realization to the security construction model of InstLink system, simultaneously has analyzed its overall security performance. |