Design and Implementation of Reversible Database Watermarking

Abstract

With the rapid development of information technology, databases are increasingly facing security threats such as data leakage, tampering, and unauthorized replication, which traditional database protection methods are now struggling to counter. Database watermarking technology is an important means of data security. It can address copyright protection and data tracking to a certain extent. However, it still faces challenges in balancing watermark robustness, data distortion, and privacy risks. In response to these issues, this paper proposes a database watermarking algorithm based on differential expansion technology and the principle of reversibility, and delves into the application of the ChaCha20 stream cipher algorithm in watermark information encryption. The proposed database watermarking algorithm analyses database characteristics to determine embedding positions and intensity, achieving effective watermark embedding with minimal impact on data integrity. The ChaCha20 algorithm enhances watermark concealment by generating a pseudo-random keystream for encryption, improving robustness against data processing. Experimental validation shows that the algorithm proposed in this paper is reversible and robust, capable of protecting database copyrights and tracing data origins while ensuring data integrity and availability. By combining differential expansion and ChaCha20 encryption, this approach provides an efficient and reliable technical means for database security protection. This research offers new perspectives for database watermarking technology and contributes to further development and application in the field.