Document from the year 2012 in the subject Computer Science - IT-Security, grade: 98, University of Greenwich (University of Greenwich), course: Network & Computer systems security, language: English, abstract: This work features the following topics: Steganography exercise, Digital Watermarking exercise, Churchill secondary school data protection report, Database Authentication, Database Authorization: Privileges and role based security, Database Authorization and data integrity (Views, Constraints), Implementing Virtual private database, Churchill secondary school database security policy, Database Security Policy and Database Security policy implementation.