| As the main platform for SUN Company to popularize the P2P technology, JXTA protocol has been applied in most of the P2P fields such as instant message, data storage, file sharing, collaborative computing and search engine, whereas it's rarely used in the field of P2P video conference systems. Although there have been some video conference systems based on P2P nowadays, they use their own basic protocols, which hinder the interaction between them. On the contrary, JXTA has the advantages of interoperability, cross-platform and versatility, so P2P video conference systems based on JXTA not only make full use of the architecture protocol of JXTA, but also make the improvement and extension of the system convenient.The purpose of this paper is to develop a P2P video conference system making use of the basic framework of JXTA platform. In order to realize the P2P video conference, we take advantage of the JMF technology and RTP protocol. JMF is used for the capture, disposal, transformation and display of the media data. And RTP is responsible for transporting the media data to the remote user. At the same time, this paper investigates and realizes the security policy management of video conference in order to guarantee the security and privacy of the conference system.This paper makes a deep study of the key technology in developing a P2P video conference system. The main work is: deep research in the search mechanism of JXTA in order to solve the peer search and locating problems; deep investigation in the technology of penetrating the firewall and NAT, and then realize the unblocked transport of media data in JXTA network; propose and realize a security management policy by importing the conceptions of security levels, policy trees and cryptographic algorithms so as to guarantee the security and privacy of the transported information. Based on these researches and analyses, the system has been implemented. |
