应用于多媒体视频文件的快速混沌加密算法研究

Research on fast chaotic encryption algorithm applied to multimedia video files

为了提高网络多媒体视频文件加解密的安全性和实时性,提出一种改进的混沌密码生成算法。该算法利用时变离散时空系统对Logistic映射数字混沌序列的产生方式进行改进,从而根据初始秘钥生成新的伪随机密钥流序列。AVI视频文件中提取出的各个帧采用新的伪随机序列进行异或操作,得到加密文件。通过Matlab仿真进行视频文件的网络传输加密实验,验证了提出加密算法的可行性。相比传统的混沌加密算法,提出的加密算法具有较高的速度和良好的扩散性能。

In order to improve the security and real-time performance of network multimedia video file encryption and decryption,an improved chaotic password generation algorithm is proposed.A two-dimensional time.varying discrete space-time system is used in the algorithm to improve the generation mode of Logistic mapping digital chaotic sequences,and generate the new pseudo.random key stream sequence according to the initial key.The new pseudo.random sequence is used to perform the XOR operation for each frame extracted from the AVI video file to obtain the encrypted file.The network transmission encryption experiment of video files was carried out with Matlab simulation,and the feasibility of the proposed encryption algorithm was verified.In comparison with the traditional chaotic encryption algorithm,the proposed encryption algorithm has faster speed and higher diffusion performance.