Arnold Michael

Fraunhofer Institut for Computer Graphics (IGD), Germany

Michael Arnold received his diploma in physics from the Julius-Maximilians University of Wьrzburg (Germany) in December 1994. Since 1996 he is a member of the research staff in the department „Security Technology for Graphics and Communication Systems" at the Fraunhofer Institute for Computer Graphics, Darmstadt, Germany. His main subjects of research are copyright management and copyright protection of audio streams. Concerning OCTALIS Michael Arnold is responsible for the secure access and delivery of imagery and corresponding information via the Internet. This involves the implementation and installation of a demonstrator, which presents the whole copyright management system.


The representation and offering of digital data brings serious security problems to the faces which cannot be solved in a monolithic security system. Therefore several mechanisms have to be integrated in a hierarchical security concept which provides controlled access to and copyright protection of multimedia data. Meeting such security demands in a sensible way requires the mastering of both tasks simultaniously in an integrated system. OCTALIS intends to unify access control and copyright protection in a single system.

Therefore the main objectives of the OCTALIS project are

This requires several considerations concerning the copyright protection and access control issues.

Copyright Protection of digital information is the subject of ongoing research which is connected with watermarking, labelling and fingerprinting. A label is an additional piece of data which is embedded at a known location between the header and the raw data of the image. A watermark is an additional piece of information which is embedded directly in the raw data. It is connected with the data in the sense, that only authorized persons who know a certain key or piece of information can extract the watermark without damaging the content of the data.

The main advantages of watermark against a label are:

Therefore the watermarking technique is the preferred protection mechanism.

Access Control can be achieved by well known cryptographic mechanisms such as authentication, encryption and integrity checks. Authentication comes into play at several places in the model. It is necessary for the correct registration of the images and the establishment of the fingerprinting technique. Along with encryption and integrity checks the authentication enables the secure data communication between the several actors in the model.


Dipl.-Phys. Michael Arnold, RundeturmstraЯe 6, 64283 Darmstadt

Tel 049 6151 155 535 Fax 049 6151 155 499 email arnold@igd.fhg.de