Abstract: Aiming at the shortcomings of single character of chaotic sequences in a large number of color image encryption algorithms and the independence of encryption algorithms,a spatial encryption algorithm based on double chaos and color images was designed.The algorithm can be decomposed into three layers by using color images.A feature that uses an associated (parallel scrambling-ordered diffusion) encryption mode for the three-layer component,making it difficult to simply singulate any one of the components of the color image,and combining multiple sets of initial conditions with Henon mapping and four-dimensional hyperchaos Generate complex chaotic sequences for use in the encryption process.The simulation results of the encryption algorithm show that the NPCR is 99.6108%,the UACI is 33.4606%,the information entropy is 7.9975,and the key space is 10^16×21.The algorithm key space is large enough to resist exhaustive attacks,and the analysis results show that the algorithm can resist differential attacks.And the proposed algorithm can effectively solve the singularity of chaotic sequence and the independence of encryption algorithm,which makes.Compared with other similar color image encryption algorithms,the encryption algorithm in this paper is more secure.

Key words: Color images, Four-dimensional hyperchaos, Henon mapping, Spatial encryption