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

Recently, an image encryption scheme based on chaotic standard and logistic maps was proposed. It was reported by a research group that an equivalent secret key can be reconstructed with only one pair of known-plaintext. Afterward, the scheme was enhanced by the original authors. Unfortunately, this paper find that the modified version still can be broken with the same breaking method. In addition, some other security defects existing in both the two schemes are reported.