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Recently, a chaos-based image encryption algorithm called MCKBA (ModifiedChaotic-Key Based Algorithm) was proposed. This paper analyzes the security ofMCKBA and finds that it can be broken with a differential attack, whichrequires only four chosen plain-images. Performance of the attack is verifiedby experimental results. In addition, some defects of MCKBA, includinginsensitivity with respect to changes of plain-image/secret key, are reported.

Breaking an image encryption algorithm based on chaos