Position scrambling (permutation) is widely used in multimedia encryptionschemes and some international encryption standards, such as the DataEncryption Standard and the Advanced Encryption Standard. In this article, theauthors re-evaluate the security of a typical image-scrambling encryptionalgorithm (ISEA). Using the internal correlation remaining in the cipher image,they disclose important visual information of the corresponding plain image ina ciphertext-only attack scenario. Furthermore, they found that the realscrambling domain--the position-scrambling scope of ISEA's scrambledelements--can be used to support an efficient known or chosen-plaintext attackon it. Detailed experimental results have verified these points and demonstratethat some advanced multimedia processing techniques can facilitate thecryptanalysis of multimedia encryption algorithms.
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