Watermarking for relational database by using threshold generator

الملخص EN

Providing ownership on relational database is a crucial issue in today internet-based application environments and in many content distribution applications.

This paper provides the effective watermarking technique to protect valuable numeric relational data from illegal duplications and redistributions as well as to claim ownership, the robustness of proposed system depending on using new hybrid techniques, first technique MAC (Message Authentication Code) that used one way hash function SHA1, second technique is threshold generator base on simple combination of odd number of register and by using secret key in proposed system.

Detecting the watermark neither requires access to neither the original data nor the watermark.

The watermark can be detected even in a small subset of a watermarked relation as long as the sample contains some of the marks.

The finally stage is the analysis of technique that used, our extensive analysis shows that the proposed technique is robust against various forms of malicious-attacks and updates to the data.