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随着移动互联网、云计算技术的发展,信息安全的问题日益凸显.为了提高音频信号传输的安全性,本文提出了一种适用于移动通信的超混沌数字语音加密算法.在密码算法中,首先,采用G.711A律标准将16位音频信号压缩编码为8位二进制序列.然后,基于Folded-towel离散超混沌映射设计了一个伪随机序列发生器.该超混沌系统具有两个正的Lyapunov指数,呈超混沌态,从而能生成更复杂的密钥序列.在加密过程中,为提高算法抵御差分攻击的能力,设计了一种适用于二进制序列的非线性交错异或运算.该算法以每帧采集的音频信号为一组,结合密文交错扩散技术和交错异或运算施加了两轮替代加密,并将本组最后密文扩散到下一组,从而实现了密文的组间扩散.之后,将算法应用于Android平台,开发了一款IP保密通话软件.实验结果和性能分析表明,该算法加密速度快、安全性高,具有大的密钥空间和强的密钥敏感性,且能够抵御统计、差分及穷举等攻击,在音频信号实时保密传输中具有良好的应用前景.
With the development of mobile Internet and cloud computing technology, the problem of information security has become increasingly prominent.In order to improve the security of audio signal transmission, this paper proposes a hyperchaotic digital voice encryption algorithm suitable for mobile communications.In the cryptographic algorithm, firstly , A 16-bit audio signal is compressed and encoded into an 8-bit binary sequence using the G.711A law standard.Then, a pseudorandom sequence generator is designed based on Folded-towel discrete hyperchaos mapping.This hyperchaotic system has two positive Lyapunov exponents , Which is hyperchaotic, which can generate more complex key sequences.In the encryption process, in order to improve the ability of the algorithm to resist differential attacks, a non-linear interleaved XOR operation for binary sequences is designed, Frames of audio signals collected as a group, combined with ciphertext interleaving and interleaved XOR operation applied two alternative encryption, and the last group of the group spread to the next ciphertext, so as to achieve the ciphertext diffusion between groups. After that, the algorithm is applied to the Android platform and an IP secret calling software is developed.Experimental results and performance analysis show that this algorithm has the advantages of fast encryption, high security, large Key space key sensitivity and strong, and can withstand statistics, differential and exhaustive attacks, has good prospects in real-time transmission of audio signals in secrecy.