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Recently, a new image scrambling (i.e., encryption) scheme without bandwidth expansion was proposed based on two-dimensional discrete prolate spheroidal sequences. A comprehensive cryptanalysis is given here on this image scrambling scheme, showing that it is not sufficiently secure against various cryptographical attacks including ciphertext-only attack, known/chosen-plaintext attack, and chosen-ciphertext...
Multimedia security has become a serious issue in todaypsilas highly computerized and interconnected world. Pareek et al. recently proposed an image encryption scheme based on multiple 1D 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...
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