一类图像载体与多混沌系统的动态音频加密算法

Dynamic audio encryption algorithm for class of image carriers and multi-chaotic systems

针对单一混沌系统在加密中有密钥空间小、安全性较低等问题,提出了图像载体与多混沌系统的动态音频加密算法。首先对明文音频进行分块以提升算法运行效率。通过初始密钥与明文音频特征值生成高级密钥,显著增加了密钥空间。设计多种混沌系统相结合的随机数发生器,并通过NIST sp800_22随机性测试来验证其随机性。将明文音频信息转移至特征矩阵P中得到音频图像,最后通过循环余数置乱算法与扩散得到加密音频图像与加密音频。仿真实验与性能测试表明:该加密算法密钥空间大、密钥敏感性强、加密音频能量分布均匀,具有较强的抗攻击性能、鲁棒性以及高效的加密效率。

Aiming at the problems of small key space and low security of single chaotic system in encryption,this paper proposed a dynamic audio encryption algorithm for image carrier and multi-chaotic system.Firstly,it blocked the plaintext audio to improve the efficiency of the algorithm,generated advanced keys from initial keys and plaintext audio feature values,significantly increasing the key space.This paper designed a random number generator that combined various chaotic systems,and verified its randomness through the NIST sp800_22 randomness test.It transferred the plaintext audio information to the feature matrix P to obtain the audio image.Finally,it obtained the encrypted audio image and encrypted audio through the cyclic remainder scrambling algorithm and diffusion.Simulation experiments and performance tests show that the encryption algorithm has large key space,strong key sensitivity,and uniforms distribution of encrypted audio energy.It has strong anti-attack performance,robustness and efficient encryption efficiency.