基于可逆元胞自动机的二值音频加密算法

摘要

Considering digital audio's characteristics of generous data, strong correlation and high redundancy and traditional digital audio encryption algorithms' dificuty in meeting the real-time and security encryption requirements, this paper introduces the reversible cellular automata (RCA) theory into the binary digital audio encryption algorithm to realize digital audio's fast and secure encryption. Firstly, a digital audio is transfonned into binary audio by using an error diffusion algorithm. Secondly, a pseudorandom binary sequence is generated with the same size of the binary processed audio sequence in the first step. The pseudorandom binary sequence and the binary audio form the initial structure, and it is encrypted by forward iteration of the RCA according to some RCA rule. The experiments show the encrypted binary audio has good randomicity and diffusibility, and it can resist some brute force attacks due to a huge key generation space.%针对数字音频文件数据量大、相关性强、冗余程度高和传统加密算法很难满足实时性和安全性要求的问题,将可逆元胞自动机(RCA)理论引入数字音频加密算法中以实现对数字音频快速、安全地加密.首先利用误差扩散算法对数字音频文件进行处理,将其转化为二值音频,然后生成与音频同长度的二值伪随机数序列,将伪随机序列与二值音频组成初始结构,应用不同的RCA规则进行多轮迭代加密.实验表明,经RCA加密的二值音频具有很好的随机性和扩散性,巨大的密匙空间可抵御蛮力破解攻击.