Image encryption scheme based on symmetric multimodal skew tent map

This paper proposes a novel scheme for image encryption based on symmetric multimodal skew tent map. The proposed map exhibits good statistical properties, such as uniformed distribution, delta-like correlation function, and high complexity. Compared to previous works based on unimodal skew tent map, the proposed scheme increases the information rate of the cryptosystem and generates chaotic key stream, which leads to a better performance in terms of randomness and security robustness against different types of attacks like statistical attack, key brute force attack and differential attack. An extensive simulation campaign has evaluated the performance of the proposed methodology. The obtained results that indicate an effective encryption and decryption processes.