【作者】 岳海；

【导师】 欧海文；

【作者基本信息】 西安电子科技大学 ， 密码学， 2008， 硕士

【摘要】 随着宽带业务的普及,IP视频传输作为宽带业务的重要应用,受到了全世界的关注。然而,安全问题却成为视频传输技术不得不面对的最大障碍,这极大地限制了视频传输技术的广泛应用。本文首先研究了视频传输系统整机方案的设计,基于视频传输的特性,采用了针对数字视频优化的Davinci系统,将SIP安全协议的实现放到了双核Davinci的ARM核中,同时针对实体视频流安全,采用了DSP加解密子系统;在整机软硬件实验环境搭建好后,探讨了现有的流行视频传输协议,从复杂性、可靠性、扩展性、支持的业务等多个角度比较SIP和H.323协议,论证了SIP协议视频传输的优势,并针对SIP的体系结构特点,详尽分析了SIP的协议格式、功能、及其在典型通信流程中存在的一些安全问题。通过研究、对比现有的SIP安全方案,分析其漏洞与不足,本文提出了一套基于PKI和逐跳加密的SIP安全解决方案,并对该方案的安全性进行了全面的分析。最后,在Davinci整机上实现了安全SIP协议的SIP服务器设计以及与加解密子系统间的SPI设备驱动的编码、调试。更多还原

【Abstract】 With the popularity of the worldwide Internet service, IP Video transmission as one of the most important service on Internet has caught the whole world attention to broadly. However, the security problems become the biggest obstacle that the development of VoIP technology has to face,which seriously limit the extensive application of multimedia transfer.Firstly, the design of the Digital Video Transmission system is studied in this paper. To the characteristic of the Video transmission, the Davinci technology that optimizes the digital multimedia transfer is used and the secure SIP protocol is implemented on the ARM926EJ-S of double kernel Davinci. To encrypt the RTP package, a DSP Encrypting subsystem is used. After the design, we discuss the characteristic of the SIP difference from H.323 protocol such as complexity, reliability, and expansibility. Then we introduce the advantages of SIP transfer in architecture, format, function and analyze the secure problem exist in the SIP protocol. By studying the mature SIP scheme and finding out its deficiency, we form a secure scheme based on the PKI and jump encryption in this article and make a comprehensive analysis to the scheme. Last, based on those study, we finish the module design of the secure SIP transmission system and the coding, debugging of SPI device driver that is used to communicate with DSP Encrypting subsystem.更多还原