A new encryption scheme for digital images based on compound Chaos algorithm is presented in this paper. The compound Chaos algorithm combines the Lorenz Chaotic system and Logistics map to generate the pseudo-random sequences. Then the pseudo-random sequences are used to produce the permutation matrix to encrypt the digital image. Matlab is used for simulation testing of the image encryption. Algorithm safety is analyzed from three aspects including the histograms comparison between original image and encrypted image, correlation coefficients of original image and encrypted image, and secret key space analysis. The experimental results indicate that the proposed encryption approach is valid and it can expand the secret key space and improve anti-aggressive ability. The compound Chaos algorithm can be also used for color digital image encryption.
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