As information hiding, the digital watermark techniques have been attracting more interests in both research and industrial fields. Relational database is widely used in many information systems, as a tool for storing and managing a data. Major issue to protect the copyright of relational data. In order to make watermarking information more intuitive and… (More)
This article deals with the RSA encryption algorithm. Its safety is analyzed using the number field sieve method. The algorithm work results allow to define a define a secret key in a simple way.