Multimedia security has become a serious issue in today's highly computerized and interconnected world. Pareek et al. recently proposed an image encryption scheme based on multiple 1-D chaotic logistic maps. However, it has been shown in [8] that the proposed scheme is insecure against the chosen-plaintext attack and also has some other security defects. Here a modified scheme is propose based on a key dependent S-box and ciphertext feedback. The modified scheme efficiently fulfills the need of real-time image encryption, while at the same time it is secure against the differential and linear cryptanalysis.
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