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This paper re-evaluates the security of a chaotic image encryption algorithmcalled MCKBA/HCKBA and finds that it can be broken efficiently with two knownplain-images and the corresponding cipher-images. In addition, it is reportedthat a previously proposed breaking on MCKBA/HCKBA can be further improved byreducing the number of chosen plain-images from four to two. The two attacksare both based on the properties of solving a composite function involving thecarry bit, which is composed of the modulo addition and the bitwise ORoperations. Both rigorous theoretical analysis and detailed experimentalresults are provided.

Breaking a chaotic image encryption algorithm based on modulo addition and XOR operation