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Recently, an image encryption scheme based on chaotic standard and logisticmaps was proposed by Patidar et al. It was later reported by Rhouma et al. thatan equivalent secret key can be reconstructed with only oneknown/chosen-plaintext and the corresponding ciphertext. Patidar et al. soonmodified the original scheme and claimed that the modified scheme is secureagainst Rhouma et al.'s attack. In this paper, we point out that the modifiedscheme is still insecure against the same known/chosen-plaintext attack. Inaddition, some other security defects existing in both the original and themodified schemes are also reported.

Breaking a modified substitution-diffusion image cipher based on chaotic standard and logistic maps