An object-oriented cryptosystem based on two-level reconfigurable computing architecture
Journal of Systems and Software
Mutual image-based authentication framework with JPEG2000 in wireless environment
EURASIP Journal on Wireless Communications and Networking
MobiMedia '06 Proceedings of the 2nd international conference on Mobile multimedia communications
Transparent and perceptually enhanced JPEG image encryption
DSP'09 Proceedings of the 16th international conference on Digital Signal Processing
Region-based selective encryption for medical imaging
FAW'07 Proceedings of the 1st annual international conference on Frontiers in algorithmics
Secure and traceable multimedia distribution for convergent Mobile TV services
Computer Communications
Image encryption using discrete parametric cosine transform
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Length-preserving bit-stream-based JPEG encryption
Proceedings of the on Multimedia and security
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Image encryption is a suitable method to protect image data. The encryption algorithms based on position confusion and pixel substitution change compression ratio greatly. In this paper, a novel image encryption algorithm combining with JPEG encoding is proposed. In luminance and chrominance plane, the DCT blocks are confused by pseudo-random SFCs (Space Filling Curves). In each DCT block, DCT coefficients are confused according to different frequency bands and their signs are encrypted by a chaotic stream cipher. The security of the cryptosystem against brute-force attack and known-plaintext attack is also analyzed. Experimental results show that, the algorithm is of high security and low cost. What's more, it supports direct bit-rate control or recompression, which means that the encrypted image can still be decrypted correctly even if its compression ratio has been changed. These advantages make it suitable for image transmission over network.