A wavelet-based fragile watermarking scheme for secure image authentication
IWDW'06 Proceedings of the 5th international conference on Digital Watermarking
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Block-wise dependency is recognized as a key requirement in fragile watermarking schemes to thwart the vector quantization (VQ) attack.It has also been observed that deterministic dependency is still susceptible to transplantation attack or even simple cover-up attack. In this work, a new fragile watermarking scheme exploiting non-deterministic dependency is proposed. To watermark the original image, each pixel is adjusted according to the consistency between a key-dependent binary watermark bit, the information from the pixel itself and the non-deterministic secret dependency information calculated froma neighborhood centered at that pixel. Localization resolution is enhanced with a post-processing operation on the output difference map.