The digital watermarking algorithm of the relational database based on the effective bits of numerical field

According to the numerical field of the relational database, the paper put forwards a database digital watermarking algorithm. The algorithm coverts digital watermarking into binary stream, and adopts error correction coding technique first, and then utilizes HASH function and control factor to determine the position of watermarking embedding to enhance the robustness of watermarking. At last, embed the watermarking binary bit stream into the lowest effective bit of numerical field of database.