一种鲁棒混沌映射及其在双频域语音加密中的应用

Yi-bo Huang, Peng-Wei Xie, Jun-Bin Gao, Qiu-yu Zhang
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引用次数: 0

摘要

将混沌系统用于语音加密时,其混沌性能在很大程度上决定了语音加密的安全性。然而,传统混沌系统存在参数不连续、易发生混沌退化、复杂度低、混沌区间存在周期窗口等问题。在实际应用中,混沌映射可能陷入周期窗口,这对安全性极为不利。本文通过改进混沌逻辑映射和正弦映射,提出了一种新的混沌映射2D-LMSM,并将其应用于语音加密。性能评估表明,该映射能在较宽的参数范围内有效地生成鲁棒混沌信号。与现有的几种二维混沌映射相比,2D-LMSM具有更好的鲁棒性和理想的混沌特性。我们提出了一种新的语音加密算法。首先对输入语音信号进行快速傅里叶变换(Fast Fourier Transform, FFT),得到实值和虚值,并利用混沌产生的伪随机数进行一次置乱加密和异或扩散加密;然后,利用离散小波变换(DWT)和2D-LMSM进行二次置乱加密;最后,通过离散小波反变换(IDWT)和快速傅立叶反变换(IFFT)得到加密语音数据。实验结果表明,该算法具有良好的加解密性能,保证了系统的安全性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Robust Chaotic Map and Its Application to Speech Encryption in Dual Frequency Domain
When chaotic systems are used for speech encryption, their chaotic performance largely determines the security of speech encryption. However, traditional chaotic systems have problems such as parameter discontinuity, easy occurrence of chaos degradation, low complexity, and the existence of periodic windows in chaotic intervals. In real applications, chaotic mappings may fall into periodic windows, which is extremely unfavorable for security. In this paper, a new chaotic mapping 2D-LMSM is proposed by improving the chaotic logistic and sine mappings, and applied to speech encryption. Performance evaluation shows that this map can effectively generate robust chaotic signals in a wide parameter range. The 2D-LMSM achieves better robustness and desired chaotic properties than several existing two-dimensional chaotic maps. We propose a novel speech encryption algorithm using this map. First, it performs Fast Fourier Transform (FFT) on the input speech signal to obtain real and imaginary values, which are encrypted by one-time scrambling encryption and XOR diffusion encryption with pseudorandom numbers generated by chaos; then, it performs secondary scrambling encryption by Discrete Wavelet Transform (DWT) and 2D-LMSM; finally, it obtains encrypted speech data by Discrete Wavelet Inverse Transform (IDWT) and Fast Fourier Inverse Transform (IFFT). Experimental results show that this algorithm has good encryption and decryption performances and ensures system security.
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