The operating principle of firewall and the types of firewalls are analyzed with its technology;based on encryption technology,its classification and algorithms are introduces with analysis;the composition of security system is expounded aimed at PKI technology which is the key of information security.

This thesis researches the procedure for identity authentication of PKI architecture, designs and implements an enhanced identity authentication system which uses PKI technology based on certificate verification, signature, and role-resource access control theory.

It discourses the composition of the network security system according to the application of encryption technology during information exchange process and the security core technology of PKI technology.

Research on Anti-fake Performance of Electronic Seal Based on PKI/CA Technique;

Selecting position technology research of main traffic centre assignment;

Comprehensive Technology Research of Agricultural Seed Quality Management;

Analysis on the injury disease and study on the maintenance and reinforcement technology research of the stone arch bridge;

Technical research of the standard apparatus of X、γ-ray exposure in radiotherapeutic degree;

Steadily promoting the technical research and the clinical application of interventional radiology for cervical spine