**5.1 IPS trusted communication mechanism**

A trusted communication mechanism proposed in this chapter applied to the correlation between firewall and IDS in a distributed intrusion prevention system. It is mainly based on middleware technology and security Protocol standard techniques. And the middleware technology is CORBA. If CORBA underlies network layer, it may encapsulate the underlying unit; which may make the application transparent to the up-layer. In this paper, TLS is applied to the trusted data transmission between firewall and IDS.
