Two Layers of Audio Security Utilizing the International Data Encryption Algorithm (IDEA) and Lorenz Chaotic Scrambler

Voice communication between individuals is an essential aspect of daily life. The significance of voice transmission security is increasing as digital communication channels become more prevalent. This paper suggests a secure and resilient voice encryption system that integrates traditional cryptography and chaotic systems. This paper introduces a digital chaotic scrambler (DCS) that is based on the Lorenz system and is designed to address the constraints of the International Data Encryption Algorithm (IDEA) in the context of voice encryption. The DCS also reinforces the resistance of the IDEA structure to many cryptographic attacks. The DCS and the strong mathematical operations of the IDEA establish a secure, efficiency, voice encryption system in real applications. The security metrics we define are used to quantify the performance of the proposed system; these include sensitivity to initial conditions, sensitivity to the key, and attack resistance. Keyspace analysis, Statistical analysis, MSE (mean square error), Signal-to-noise ratio (SNR), correlations and (Segmental spectral signal-to-noise ratio) SSSNR and Cepstral Distance (CD) analyses results. Statistical analyses and audio security tests performed on audio files of different sizes with a WAV file extension have shown that the algorithms proposed are resistant to brute force or statistical attacks and have a higher security level.