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《Journal of Huazhong University of Science and Technology(Nature Science Edition)》 2007-03
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A novel method to encrypt video variable length coding codeword by random number sequences

Yang Zhiyun1 Chen Lin2 Li Wei1 Xu Zhengquan1(1 State Key Laboratory for Information Engineering in Surveying,Mapping and RemoteSensing,Wuhan University,Wuhan 430079,China;2 College of Computer Science,YangtzeUniversity,Jingzhou 434023,Hubei China)  
Video variable length codewords were encrypted by randomly changed variable length coding table while each codeword was coded.The codewords were grouped into the table according to their length.While coding the video event stream,a random number corresponding to every event was generated to decide which codeword in its group the event should be coded to.The randomness of the number sequence was ensured by generated from binary system random sequence.The difficult problem of generating forbidden codewords was solved while enciphering video in the algorithm.It can completely keep video coding format compliance and compression ratio.It has the same anti-attack strength as direct stream cipher method while its speed is over ten times faster than the latter to meet real-time requirement.The experiments show that the cipher pictures are fully disguised.The method can be applied to MPEG,H.26x,and JPEG signal,and can be made as a separate modular.
【Fund】: 国家重点基础研究发展计划资助项目(2006CB303104);; 湖北省科技攻关计划资助项目(2004AA101C18);; 武汉市重点科技攻关计划资助项目(20031003021)
【CateGory Index】: TN919.81;TN918.6
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