Abstract:

To address the problem that the range of control parameters corresponding to the logistic mapping full shot in the image encryption system is too small, and the resisting ability of the encryption system to differential cryptanalysis needs to be improved, this paper designed an encryption algorithm based on the improved logistic mapping and dual-image blending. This system was based on the plaintext associative dislocation algorithm and used the dual-image blending as the pre-processing operation of image encryption, while the improved logistic mapping was applied to generate a random matrix for image diffusion. The improved logistic mapping effectively improved the range of values of the corresponding control parameters at full shot, and the dual-image blending pre-processing improved the ability of the encryption system to resist differential cryptanalysis. The experimental results show that the proposed encryption system has good performance in histogram analysis, correlation analysis, and sensitivity analysis, and can effectively resist various attacks such as exhaustive attack, differential cryptanalysis, and information entropy attack.

Key words: image encryption, logistic mapping, dual-image blending, pre-processing, plaintext associative dislocation algorithm