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Recently, a novel image fusion encryption algorithm based on DNA sequence operation and hyper-chaotic system was proposed. It was reported that the scheme can be broken with 4mn/3+1 chosen plain-images and the corresponding cipher-images, where mn is the size of the plain-image. This paper re-evaluates the security of the encryption scheme and finds that the encryption scheme can be broken with less...
The F-function is the main part of the Camellia algorithm, used in encryption, decryption and key expansion. In this paper, the construction and properities of the F-function, especially the S-function in the F-function, are studied. A more detailed description of the S-function is given, which is more conducive to the understanding of the S-function look-up table. And the avalanche property of the...
Block ciphers' security mostly depends on S-box which is the only non-linear structure in most block ciphers. This paper studies and compares the avalanche property of the AES S-box and Camellia S-box, finally confirms that the AES S-box and Camellia S-box both satisfy the strict avalanche criterion basically.
The Camellia algorithm has four S boxes called as S1, S2, S3 and S4. Because the S1-box is the core of other S boxes, the avalanche property of S boxes can be studied through testing the avalanche property of S1-box. The test results show that the Camellia S-box basically meet the strict avalanche criterion.
The avalanche effect is an important performance that any block cipher must have. With the AES algorithm program and experiments, we fully test and research the avalanche effect performance of the AES algorithm, and give the changed cipher-bit numbers when respectively changing every bit of the plaintext and key in turn. The test results show that the AES algorithm has very good avalanche effect Performance...
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