A BIT-LEVEL AUDIO ENCRYPTION ALGORITHM USING A NEW HYBRID CHAOTIC MAP

Abstract

Audio data is increasingly transmitted worldwide, necessitating robust encryption techniques to safeguard it from malicious actors. To secure transmitted audio files, a novel, and effective audio encryption method is introduced using a newly designed 1D chaotic map and bit-level operations in this work. The Sine-Chebyshev Hybrid Map (SCHM) is a new chaotic map with high randomness, created using two classical maps, such as the Sine map and the Chebyshev map. Two-dimensional (2D) and three-dimensional (3D) phase trajectories, bifurcation diagrams, initial condition sensitivity, Lyapunov exponent, and approximate entropy results of the proposed map are given. The analysis results show that SCHM has better chaotic properties and a wider chaotic range than the sine and Chebyshev maps. The algorithm implemented with SCHM, bit-level permutation, and diffusion operations can encrypt mono-channel or stereo-channel audio files losslessly. Various security analyses are performed to test the degree of security of the proposed audio encryption algorithm. The performance tests conducted on four different audio data verify that the proposed scheme is secure and can be used to encrypt one-channel or two-channel audio files.