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中文摘要：
为了使可伸缩视频流在异构网络中达到分层安全等级的目的,运用随机函数来随机化视频流各层中的部分数据流,并结合网络编码来抵御已知的明文攻击。此外,对网络编码器进行了研究,设计有序随机线性网络编码器用于可伸缩视频的传输,可以用很少的随机化操作来达到可扩展的安全等级,并降低通信开销。分析表明,所提方案可有效增加网络的吞吐率。
英文摘要：
With the purpose to achieve hierarchical security levels for scalable video streaming in heterogeneous net- works, random function was used to randomize parts of the video streaming in each layer. Network coding scheme was also used to resist known-plaintext attacks. Moreover, network encoder was studied. Ordered random linear network en- coder was designed for scalable video transmission. It could achieve scalability in security levels with few random opera- tions and reduce communication overhead. Analysis shows that the scheme could effectively increase the network throughput.
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