On the security defects of an image encryption scheme
Image and Vision Computing
Overview on selective encryption of image and video: challenges and perspectives
EURASIP Journal on Information Security
An objective visual security assessment for cipher-images based on local entropy
Multimedia Tools and Applications
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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 attack. Detailed cryptanalytic results suggest that the image scrambling scheme can only be used to realize perceptual encryption but not to provide content protection for digital images.