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Under Kerckhoff principle,this paper discusses the security property of an image encryp-tion scheme with a pseudorandom permutation.Some findings on the security problems of the algo-rithm are reported in the following:(1) If each row or column of the plain-image matrix is the same,the receiver cannot decrypt correctly.(2) Each plain-text word is correlated with single cipher-text word,but independent of other cipher-text word,which cannot meet the principles of algorithm design-diffusion and confusion.(3) If the cycle numbers are relatively small,statistics attack can be used to reveal some visual information of any other plain-images encrypted with the same secret key.Con-sidering the above problems,we propose an improved algorithm and then analyze its performance.Theoretical analysis and simulation results show that the improved algorithm can obtain better cryptographic properties,such as statistical characteristics,difference characteristics,and so on.
Under Kerckhoff principle, this paper discusses the security property of an image encryp tion scheme with a pseudorandom permutation. Home findings on the security problems of the algo-rithm are reported in the following: (1) If each row or column of the plain -image matrix is the same, the receiver can not decrypt correctly. (2) Each plain-text word is correlated with single cipher-text word, but independent of other cipher-text word, which can not meet the principles of algorithm design-diffusion and confusion. (3) If the cycle numbers are relatively small, statistics attack can be used to reveal some visual information of any other plain-images encrypted with the same secret key. Conf-sidering the above problems, we propose an improved algorithm and then analyze its performance. theoretical analysis and simulation results show that the improved algorithm can obtain better cryptographic properties, such as statistical characteristics, difference characteristics, and so on.