Cryptanalysis on an Image Encryption Scheme
MA Junmin · 2015
An image encryption scheme based on cat map and Lu chaotic map was proposed recently,where the cat map was utilized to shuffle the pixel positions of the plain- image and the Lu chaotic map was adopted to generate pseudo- random sequences to change the pixels gray values of the shuffled image by bitwise XOR operation. In this paper,we give three kinds of cryptanalysis on this image encryption scheme,including chosen ciphertext attack,chosen plaintext attack and known plaintext attack. In the proposed scheme,the cipher- image is independent on the plain- image and there exists a secret matrix equivalent to the secret parameters. We break the proposed encryption scheme by finding the equivalent secret matrix theoretically. Simulation experiments realize the three kinds of attacks as well.