An improved DyTrust trust model;

Fuzzy autonomous trust model based on open network;

Research into a trust model based on subjective trust and recommendation;

Research on P2P Trust Models;

PKI Trust Mechanisms and Its Application in Trust Models;

Researches on Trust Models of P2P Network Security;

Then the authors sum up the studies about trust model in e-commerce, and point out the research direction about trust studies in e-commerce in the future.

To evaluate trust values of nodes and establish trust relationship in nodes, a trust model is proposed on the basis of the analyses of the existing trust models and the minimal principle of uncertainty metric.

This article first analyzes the character and weakness of the traditional fire walls,then introduces three new type firewall technologies : Distributed Firewall Technology , Intranet Safety Technology on Intelligent Fire-wall, Firewall Grope Security Protection Architecture based on Trust Mode , and analyzes their structure characters and work methods in detail.