Abstract: The traditional campus network system uses firewall and some access control policies to ensure its security, the network of this model just can prevent the danger from external, but can not effectively guard against the internal hidden security flaws, therefore, improving the internal security is an important link for secirity of the whole campus network. This paper analyzes the principle and characteristic of trusted network, applies the trusted network into the campus network, puts forward a new campus network system based on the authentication technology, at the same time, also describes its structure and elements, and gives the network topology diagram, finally analyzes the priciple of security mechanism and the specific methods for achieving this. 

Key words: authentication, campus network, trusted LAN, security