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A fast image encryption scheme based on a nonlinear chaotic map is proposed in this paper. Only by XOR operation, the pixel gray values of the plain-image are modified from the first pixel to the last pixel firstly, and then the modified image is encrypted from the last pixel to the first pixel in the inverse order. Every time the chaotic map is iterated, n bytes random numbers which are used to mask...
Recently, two chaotic image encryption schemes were presented, in which shuffling the positions and changing the grey values of image pixels were combined to confuse the relationship between the cipher-image and the plain-image. In this paper, we provide the known/chosen plaintext attack to recover the corresponding plaintext of a given ciphertext. Furthermore, we point out that the two schemes are...
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