双混沌自同步流密码算法的设计与应用

视频在网络传输过程中需要利用密码进行加密以获得数据的保密性。针对视频存在数据量大和实时性强的特点，提出了一种双混沌自同步流密码算法，以提升加密视频的安全性能和加密效率。密码算法由两个离散时间混沌系统构成：首先，采用混沌反控制方法设计两个三维离散时间混沌系统；然后，将第一个混沌系统的状态变量作为第二个混沌系统的反控制器；最后，将第二个混沌系统迭代产生的状态变量与明文信息进行加密操作。该算法能够有效抵御选择密文攻击与分别征服攻击，具备良好的安全性能。实验测试表明，算法能够达到每秒25帧以上的实时性能，具有良好的加密效率。

Design and Application of a Dual-chaotic Self-synchronous Stream Cipher Algorithm

Video data needs to be encrypted with cryptographic algorithms to obtain data confidentiality during network transmission.According to the characteristics of large amount of data and strong real-time performance of video stream,a dual-chaotic self-synchronizing stream cipher algorithm is proposed for video encryption to improve the security performance and encryption efficiency.The cipher algorithm is composed of two discrete-time chaotic systems.First,two three-dimensional discrete-time chaotic systems are designed with chaos anti-control method.Then,a state variable of the first chaotic system is used as the anti-controller of the second chaotic system.Finally,state variables generated by the second chaotic system are used for encryption operation with the plaintext information.The proposed algorithm can effectively resist chosen-ciphertext attack and divide-and-conquer attack with good safety performance.Experimental tests show that the algorithm exhibits good encryption efficiency with over 25 frames per second rate.