Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/116772
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Reversible and semi-blind relational database watermarking
International Conference on Signal Processing and Multimedia Applications (2nd : 2007) (28 - 31 July 2007 : Barcelona)
Sergio Faria, Pedro Assuncao. SIGMAP 2007 : Proceedings of the Second International Conference on Signal Processing and Multimedia Applications : Barcelona, Spain, July 28 - 31, 2007 ; one of the modules of the ICETE joint conference, p.283-290
Database watermarking has received significant research attention in the current decade. Although, almost all watermarking models have been either irreversible (the original relation cannot be restored from the watermarked relation) and/or non-blind (requiring original relation to detect the watermark in watermarked relation). This model has several disadvantages over reversible and blind watermarking (requiring only watermarked relation and secret key from which the watermark is detected and original relation is restored) including inability to identify rightful owner in case of successful secondary watermarking, inability to revert the relation to original data set (required in high precision industries) and requirement to store unmarked relation at a secure secondary storage. To overcome these problems, we propose a watermarking scheme that is reversible as well as blind. We utilize difference expansion on integers to achieve reversibility. The major advantages provided by our scheme are reversibility to high quality original data set, rightful owner identification, resistance against secondary watermarking attacks, and no need to store original database at a secure secondary storage.