Image encryption based on the combination of roulette wheel selection with linear congruence pixel transformation

摘要

To overcome the challenges encountered in chaotic image encryption system, such as dynamic degradation, weak security, and low encryption efficiency, this paper proposes a new image encryption algorithm. In terms of key generation method, a roulette wheel selection algorithm is designed, which effectively reduces dynamic degradation. In pixel coding, a linear congruence pixel transformation method is proposed, which enhances the security of pixel transform. In the overall layout of the encryption algorithm, the substitution-permutation-substitution structure is adopted. Under the joint action of various aspects, encryption efficiency is improved while security of our proposed encryption algorithm is guaranteed. Additionally, during design, the motivation of each part of the algorithm is explained. Theoretical analysis and experimental results show our proposed algorithm has a good application prospect.