Abstract:The PKI uses the certificate to manage the public key, that is, through the trusted third-party organizations--Certificate Authority, the PKI ties the user s public key and other identification information together and realizes the application of the roaming certificate on the Internet net.

In order to prevent illegal users from visiting legal resource, the authors analyze the problems existing in the standard of security protocol and put forward a private key certificate contain attribute.

On walkthrough system of residential zone and its realization;

Design and implementation of walkthrough system based on Virtools;

Through the roaming system the user can go to every corner of the school.

Quanjing roaming system is the recent emergence of the Internet on a new interactive virtual scenes express way, which way panorama reproduce three-dimensional scene can be used to realize the corresponding browser roaming virtual scene with a very good exchange and realistic.