Digital watermarking for relational databases using traceability parameter

摘要

Proving ownership right on outsourced relational database is a crucial issue in today's internet-based application environments and in many content distribution applications. We present a mechanism for proof of ownership which is based on the secure embedding of a robust imperceptible watermark in the relational database. It is achieved by formulating a watermarking method, which will watermark only the numeric attributes and introduce the traceability parameter in the watermark detection technique. This monitors the modifications made to the relational database by the attacker. Proposed watermark detection technique is having a time complexity of O(η), where η is the number of tuples in the relational database and this technique is resilient to subset attack, alteration attack and data replacement attack.