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arXiv 0801.0276nlin.CD
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Cryptanalysis of a Chaotic Image Encryption Algorithm

Nikhil Balaji, Nithin Nagaraj

英文摘要:

Line map, an invertible, two-dimensional chaotic encryption algorithm was introduced recently. In this paper, we propose several weaknesses of the method based on standard cryptanalytic attacks. We perform a side-channel attack by observing the execution time of the encryption algorithm and successfully reduce the key space by a factor of 10^4 for a key length of 16 digits. We find the existence of equivalent keys which reduce the key space by a significant margin, even in the absence of any attack. Also, we find that the ciphertext is not sensitive to small changes in the plaintext due to poor diffusion.

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