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Low-dimensional chaotic encryption has a good operational efficiency but there is a problem of security flaws, therefore this paper proposes a composite chaos encryption system based on double mapping. Double mapping with mutual disturbance were used to generate the key sequence, and respectively with odd and even number of image pixels to realize the image encryption. The simulation results show that, the effect is very good; Correlation and so on security analysis shows that meet the requirements of the security; System overall evaluation results show that the proposed algorithm has better security and ease of implementation, can effectively resist brute force attack, statistic attack etc.

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