本文提出将帧内、帧间预测模式置乱, 量化系数与运动矢量加密相结合的H􀀁 264 视频加密方法, 试验表

明此方法具有良好的加密效果, 其算法复杂度低, 对编码效率影响小, 适合实时应用 在此基础上我们进一步提出了一

套完整的视频加密系统, 通过将二层序列密钥同步与告知机制相结合的方法实现了快速序列密钥同步, 多用户访问控

制, 并扩大了序列密钥的产生空间, 增加了系统的安全性.-A new video encryption method which utilized Intra, Inter prediction mode scrambling, transform results and mo􀀁

tion vector encryption is propo sed in this paper based on the formers􀀁　research work. Test showed that this method exhibits nice se􀀁

curity　 moreover its computational complexity is rather low, has little impact on encoding efficiency and can be realized in real time

environment. A video encryption sy stem based on the algorithm is also put up, the fast synchronize of the streaming key and multiple

user access is achieved by two􀀁 level synchronization and telling mechanism.