| 一种基于格雷码变换和M序列异或的MPEG视频加密算法 |
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| 引用本文： | 王栋.一种基于格雷码变换和M序列异或的MPEG视频加密算法[J].计算机安全,2010(5):14-17. |
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| 作者姓名： | 王栋 |
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| 作者单位： | 重庆大学计算机学院,重庆,400044;武警海南省总队第一支队,海南,海口,571126 |
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| 摘 要： | 在多数的视频加密算法中,视频加密后的数据流会显著增大,因为这些算法没有考虑到视频编码特点,导致传输吞吐率的下降。结合MPEG编码特点,利用格雷码和自然二进制码相互转换的易生成性,以及M序列良好的随机特性,提出一种快速视频加密算法。算法先在宏块DCT变换之前进行空域置乱运算,然后对Z字型扫描后的DC和AC系数符号位进行异或运算。加密后的数据大小不变,且加密速度快,两种算法结合安全性高。
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| 关 键 词： | 格雷码 M序列 DCT系数符号位 MPEG视频加密。 |
MPEG Video Encryption Algorithm Based on Gray Code Transformation and M-sequence Xor |
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| WANG Dong.MPEG Video Encryption Algorithm Based on Gray Code Transformation and M-sequence Xor[J].Network & Computer Security,2010(5):14-17. |
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| Authors: | WANG Dong |
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| Affiliation: | 1.College of Computer Science;Chongqing University;Chongqing;400044;China;2.The first Division of Hainan Provincial Corps of CAPF;Haikou;Hainan 571126;China |
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| Abstract: | In most cases of video encryptions,the sizes of video streams encrypted are often so significantly enlarged by the algorithms without considering the characteristics of video code that the transmission throughput decreases.Basing on the facilitiy in transformations between Gray code and natural binary code and randomicity of M-sequence,a fast video encryption algorithm is proposed in this thesis with considering the characteristics of MPEG video code.This algorithm is a combination between the spatial domai... |
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| Keywords: | Gray code M-sequence Signbits of the DCT coefficients MPEG video encryption |
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