Research on encryption and decryption algorithm of audio with chaotic mapping

Abstract

With the audio application in the modern communication technology, audio information is necessary to ensure safety in the transmission section of communication system. The technique used to privately and securely transmit an audio (voice) signal by applying two-dimensional (2D) Henon and one-dimensional Logistic (1D) maps is introduced to enhance the security by increasing the key space and the dimension which in turn increases the nonlinearity. In this paper, The algorithm uses the chaotic iteration to generate the symmetric encryption keys, and then carries out the XOR operation on the plaintext (audio signal samples) to form the cipher text (encrypted signal samples).The algorithm owns large key space to make brute-force attack impossible. Statistical analysis demonstrates the effectiveness for fast audio encryption, the simulation is performed in MATLAB and the results are observed. The results showed the effectiveness of the proposed scheme in terms of security due to its large key space, nonlinearity and sensitivity to the keys.

Keywords -Audio signal, PCM, Encryption and Decryption, Chaotic Mapping.