Article

An Efficient Modified Advanced Encryption Standard (MAES) Adapted for Image Cryptosystems

“ IJCSNS International Journal of Computer Science and Network Security 02/2010; 10.
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Available from: Bahaa Hasan, Mar 08, 2014
    • "This property is clearly shown in figure 5 a) b) c) and d). We clearly remark that the histogram of the cipher image is uniformaly distributed, compared to the plain one, hence it does not support any similarity to the plain image [12]. "

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    • "This property is clearly shown in figure 5 a) b) c) and d). We clearly remark that the histogram of the cipher image is uniformaly distributed, compared to the plain one, hence it does not support any similarity to the plain image [12]. "
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    ABSTRACT: In the last two decades, several chaos-based cryptosystems have been proposed. Some of them have architecture comprising a layer of permutation and a layer of diffusion and these layers are simultaneously executed in a simple scan of plain-image pixels. In this kind of cryptosystems, due to the channel effect, a bit error(s) in the cipher-image produces, at the decryption side, a random bit error in the estimated plain-image. In this paper, we propose a cipher-block encryption algorithm in CBC (Cipher Block Chaining) mode. It consists of a permutation process on the bits achieved by a 2D-cat map, followed by a bitwise XOR operation. Here, each permuted bit (confusion phase) is immediately diffused in a simple manner in the same phase. Therefore, the confusion and diffusion effects are stronger and the cryptanalyses for permutation-only ciphers become ineffective.
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    ABSTRACT: Recently, compressive sensing-based encryption methods which combine sampling, compression and encryption together have been proposed. However, since the quantized measurement data obtained from linear dimension reduction projection directly serve as the encrypted image, the existing compressive sensing-based encryption methods fail to resist against the chosen-plaintext attack. To enhance the security, a block cipher structure consisting of scrambling, mixing, S-box and chaotic lattice XOR is designed to further encrypt the quantized measurement data. In particular, the proposed method works efficiently in the parallel computing environment. Moreover, a communication unit exchanges data among the multiple processors without collision. This collision-free property is equivalent to optimal diffusion. The experimental results demonstrate that the proposed encryption method not only achieves the remarkable confusion, diffusion and sensitivity but also outperforms the existing parallel image encryption methods with respect to the compressibility and the encryption speed.
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