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A Novel Audio Encryption Algorithm with Permutation-Substitution Architecture

Department of Computer Informatics, Faculty of Mathematics and Computer Science, Konstantin Preslavsky University of Shumen, 9700 Shumen, Bulgaria
Electronics 2019, 8(5), 530; https://doi.org/10.3390/electronics8050530
Received: 7 April 2019 / Revised: 4 May 2019 / Accepted: 6 May 2019 / Published: 11 May 2019
(This article belongs to the Section Computer Science & Engineering)
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Abstract

In this paper, a new cryptographic method is proposed, designed for audio files’ security. The encryption algorithm is based on classic symmetric models using pseudo-random number generator composed with chaotic circle map and modified rotation equations. The scheme of a new pseudo-random generator is presented and used as basis for chaotic bit-level permutations and substitutions applied to audio files structure for successful encryption. The audio encryption and decryption algorithms are described and explained. Proving the high level of security we provide extensive cryptographic analysis including key sensitivity analysis, key-space analysis, waveform and spectrogram analysis, correlation analysis, number of sample change rate analysis, level of noise analysis and speed performance test. View Full-Text
Keywords: audio encryption; permutation; substitution; pseudo-random number generator; circle map; rotation equation audio encryption; permutation; substitution; pseudo-random number generator; circle map; rotation equation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kordov, K. A Novel Audio Encryption Algorithm with Permutation-Substitution Architecture. Electronics 2019, 8, 530.

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