摘要： 现有格式兼容的加密算法在安全性、可操作性和解码耗时等方面各有优劣。针对上述情况，提出一种新的视频加密算法。该算法根据MPEG视频标准，通过改变宏块条竖直位置值进行置乱，实现图像的加密。理论分析与仿真实验结果证明，该算法简单易行，安全性高，加密数据量少，加密速度快，且对数据压缩率无影响。

关键词: 格式兼容, 宏块条竖直位置, 一一映射加密

Abstract: Format-compliant video encryption algorithms have their own merits and defects on safety, operability and decoding time-consuming. Aiming at the situation, this paper proposes a novel format-compliant video encryption algorithm which is convenient, secure, fast and has no effect on the compression ratio. Videos are encrypted by permutation through changing the value of the vertical position for macro-blocks. Simulation results on two standard video sequences show that compared with the original one, the new algorithm is more effective.

Key words: format-compliant, macro-block-vertical position, one-to-one mapping encryption

中图分类号: 

• TP309.2