基于AAC音频编码与混沌加密的语音加密技术实现  

Implementation of voice encryption technology based on AAC audio coding and chaotic encryption

作　　者：王先泉[1] 

机构地区：[1]广东工业大学自动化学院,广东广州510006

出　　处：《现代电子技术》2012年第24期4-6,10,共4页Modern Electronics Technique

摘　　要：为了减少语音的加密数据量,在此提出一种基于压缩编码和混沌加密的语音加密方案。采用先编码后加密的实现方法,语音编码算法采用AAC低复杂度编码算法,加密算法采用二维猫映射算法,在ARM9硬件平台下的实现结果表明AAC编码压缩比为18∶1,猫映射加解密算法执行效率快,解密后无失真,实验结论证实该方案是可行的。在此将音频压缩算法与混沌加密结合起来,在不影响语音音质和加密效果的前提下减少了加密运算的数据量以及最终加密文件的大小,缩短了加解密语音数据所花费的时间,减少了语音保密通信所需要的带宽。A voice encryption program based on compression encoding and chaotic encryption is proposed in this paper for reducing the voice encryption data size, The implementation method to encode first and then encrypt is used in the progam. AAC low complexity encoding algorithm is adopted in the speech coding algorithm. The two-dimensional cat map algorithm is adopted in the encryption algorithm. The result achieved in ARM9 hardware platform indicates that the AAC encoding ratio of 18 ： 1, the cat map encryption-decryption algorithm has high execution efficiency, and there is no distortion after decryption. The experimental results confirm that the program is feasible. The innovation of this paper is the combination of audio com- pression algorithm and chaotic encryption. It reduced the data size of encryption operation and the size of final encrypted files, shortened the time spent in encrypting and decrypting the voice data, and narrowed the bandwidth required for voice secure communication on the premise not to affect the voice quality and encryption effect.

关 键 词：语音保密通信 AAC编码 混沌加密 猫映射 ARM9 

分 类 号：TN919-34[电子电信—通信与信息系统]