Randomness Evaluation of a Genetic Algorithm for Image Encryption: A Signal Processing Approach

• URL: http://arxiv.org/abs/2008.03681v1
• Date: Sun, 9 Aug 2020 07:50:29 GMT
• Title: Randomness Evaluation of a Genetic Algorithm for Image Encryption: A Signal Processing Approach
• Authors: Zoubir Hamici
• Abstract summary: The GFHT cipher is a genetic algorithm that combines gene fusion (GF) and horizontal gene transfer (HGT) both inspired from antibiotic resistance in bacteria. The encryption starts by a GF of the principal key-agent in a single block, then HGT performs obfuscation where the genes are pixels and the chromosomes are the rows and columns.
• Score: 7.310043452300736
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In this paper a randomness evaluation of a block cipher for secure image communication is presented. The GFHT cipher is a genetic algorithm, that combines gene fusion (GF) and horizontal gene transfer (HGT) both inspired from antibiotic resistance in bacteria. The symmetric encryption key is generated by four pairs of chromosomes with multi-layer random sequences. The encryption starts by a GF of the principal key-agent in a single block, then HGT performs obfuscation where the genes are pixels and the chromosomes are the rows and columns. A Salt extracted from the image hash-value is used to implement one-time pad (OTP) scheme, hence a modification of one pixel generates a different encryption key without changing the main passphrase or key. Therefore, an extreme avalanche effect of 99% is achieved. Randomness evaluation based on random matrix theory, power spectral density, avalanche effect, 2D auto-correlation, pixels randomness tests and chi-square hypotheses testing show that encrypted images adopt the statistical behavior of uniform white noise; hence validating the theoretical model by experimental results. Moreover, performance comparison with chaos-genetic ciphers shows the merit of the GFHT algorithm.

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