A Theory for Multiresolution Signal Decomposition: The Wavelet Representation
IEEE Transactions on Pattern Analysis and Machine Intelligence
The JPEG still picture compression standard
Communications of the ACM - Special issue on digital multimedia systems
Cryptographic copyright protection for digital images based on watermarking techniques
Theoretical Computer Science - Special issue: cryptography
Handbook of Applied Cryptography
Handbook of Applied Cryptography
Information Hiding Techniques for Steganography and Digital Watermarking
Information Hiding Techniques for Steganography and Digital Watermarking
Attacks on Copyright Marking Systems
Proceedings of the Second International Workshop on Information Hiding
Evaluation of Copyright Marking Systems
ICMCS '99 Proceedings of the IEEE International Conference on Multimedia Computing and Systems - Volume 2
A note on the limits of collusion-resistant watermarks
EUROCRYPT'99 Proceedings of the 17th international conference on Theory and application of cryptographic techniques
Secure spread spectrum watermarking for multimedia
IEEE Transactions on Image Processing
Optimal differential energy watermarking of DCT encoded images and video
IEEE Transactions on Image Processing
Cryptanalysis of “wavelet tree quantization” watermarking scheme
IWDC'04 Proceedings of the 6th international conference on Distributed Computing
Cryptanalysis of a wavelet based watermarking scheme
IWDW'04 Proceedings of the Third international conference on Digital Watermarking
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In this paper we provide a cryptanalysis of the well known "Optimal Differential Energy Watermarking (DEW)" scheme. The DEW scheme divides the image into some disjoint regions (each region containing two subregions). The watermark is basically a secret binary string where each individual bit information is inserted in one of the regions by modifying the high frequency DCT (Discrete Cosine Transform) coefficients. This modification creates required energy difference between two subregions. We here modify the high frequency components so that this energy difference vanishes and in turn extraction of watermark signal becomes impossible, making the cryptanalysis successful. Moreover, we modify the DEW scheme by inserting the bit information in low frequency components instead of high frequency components and propose an oblivious robust watermarking strategy which can trace the buyer too.