This paper analyzes the problems in image encryption and decryption based\non chaos theory. This article introduces the application of the two-stage Logistic\nalgorithm in image encryption and decryption, then by information entropy\nanalysis it is concluded that the security of this algorithm is higher\ncompared with the original image; And a new image encryption and decryption\nalgorithm based on the combination of two-stage Logistic mapping and\nM sequence is proposed. This new algorithm is very sensitive to keys; the key\nspace is large and its security is higher than two-stage Logistic mapping of\nimage encryption and decryption technology.
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