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中文摘要：
近年来，多点数据传输成为一个热门话题，广泛应用于各种P2P网络中。随着网络资源的共享越来越被强化，由于对等网络缺乏集中化的管理，安全性难以保证，多点数据传输系统的大规模商业应用所面临的安全问题越来越突出。针对P2P网络的安全问题，设计了一种公钥认证模式来识别用户身份，并实现了一个多点数据传输系统，该系统包括文件分块下载、即时聊天及音频／视频服务等常见应用。
英文摘要：
In recent years, multi-point data transmission has become a hottopic and is widely used in various P2P networks. With the increased enhancement of network resources sharing, it is hard to guarantee the security of peer-to-peer system due to the lack of centralized management; the security problems faced by the large-scale commercial application of muhi- point data transmission system are increasingly prominent. To tackle this security problems of P2P networks, a public key certification model for authentication of user＇s identity is proposed, and a multi-point data transmission system is implemented, which includes such common applications as sub-block file download, real-time chat, audio/video services.
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