基于嵌入式流媒体系统的安全机制研究

【作者】 李君斌；

【导师】 孙斌；

【作者基本信息】 浙江大学 ， 电路与系统， 2008， 硕士

【摘要】 随着流媒体技术的迅速发展,特别是将嵌入式技术、流媒体技术以及Internet技术的结合,很多嵌入式流媒体系统将不再是一个个孤立的系统,系统的互联使得信息安全问题变得更加突出。针对传统的嵌入式流媒体系统对于身份认证以及验证数据源是否合法的安全性能不足,本论文根据特定业务需求,设计并实现了一个基于嵌入式μClinux平台的网络流媒体播控系统。在改进型RADIUS协议与对应的CHAP协议基础上,提出了基于DSP的用户身份认证方式。同时论文针对嵌入式系统资源有限的特点,提出本地播放与网络播放两种模式有机结合的方式,解决了流媒体播放系统在带宽受限和网络延时不确定条件下节目播放质量不稳定的问题。此外,本论文提出一种针对数据源的合法性进行验证的数字水印检测算法,改进了系统的功能。测试结果表明,本系统的设计已经初步满足流媒体播控系统的应用需求,为进一步推广应用建立了必要的基础。更多还原

【Abstract】 Many embedded streaming media system will be not a independent system with the streaming media technology rapidly developing, specially combining embedded technology , streaming media and internet technology. The inter-connection among systems make the problem for information security standing out. The security performance of user identity authentication and checking the data source’s validity for traditional embedded streaming media system is not enough. This paper has designed and implemented one networking steaming media playing system based on embeddedμClinux platform, according to special business requirements. It presents one user identity authentication way based on modified RADIUS protocol and its CHAP protocol. Meanwhile, the system support local play and play in the internet for the limited resource of embedded system. And it has settled the problem that the Qos of playing under the condition of limited bandwidth and uncertain network delay. Additionally, this paper has been presented and implemented digital watermarking detecting algorithm for checking the data source’s validity to improve function-complete system. Test results show that the performance of the system meets application requirements, which lays down a necessary base for commercial system deployment.更多还原