Förderverein Informationstechnik und Gesellschaft

Department A8: "Controlable User Access on Multimedia Data Department A8 Security Technology for Graphics and Communication Systems

The Security Technology for Graphics and Communication Systems department is concerned with the design and implementation of security services (confidentiality, integrity, digital signatures, etc.) and their integration into information and communication systems.

Controlable User Access on Multimedia Data in the World Wide Web

D. Storck and E. Koch


This paper describes a possible way of controlling access to image data via the World Wide Web. It describes how images are encrypted using a novel technique and delivered from a server. When exchanging data, a protocol ensures that requests are always tied to a registered user and that all critical data are transferred in encrypted form. User actions are permitted and logged by the server. Activities such as storing and printing are possible only after obtaining permission from the server. If illicit copies are obtained somehow despite this, an additional watermarking system permits identification of the distributor of the illicit copy. The system was implemented as a Netscape plug--in.