A new audio encryption algorithm based on chaotic block cipher

In this paper, new encryption algorithm for audio file is proposed based on a combination between block cipher and chaotic maps. The proposed algorithm encrypts and decrypts a block size of 625(25 × 25) bytes. Each block is inputs into three sages: Permutation stage, Xor adding stage, Substitution stage. In Permutation stage the audio block is permuted using chaotic Tent map. Then the resulted block is Xored with the key block and finally the resulted block is substituted using new substitution method based on multiplication inverse. The key is generated by new key generation algorithm based on Chebyshev polynomial. This algorithm was performed and analysis with audio files of varies sizes of a WAV file extension. The results from key space analysis, statistical analysis, MSE (mean square error) analyses, PSNR (Peak signal to noise ratio) analyses and entropy analyses showed that the algorithm is not vulnerable to brute force attacks, statistical attacks and achieve higher level of security.