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- Jana Dittmann, Alexander Behr, Mark Stabenau, Peter Schmitt, Jörg Schwenk, Johannes Ueberberg
- Security and Watermarking of Multimedia Contents
- 1999

Digital watermarking is the enabling technology to prove ownership on copyrighted material, detect originators of illegally made copies, monitor the usage of the copyrighted multimedia data and analyze the spread spectrum of the data over networks and servers. Embedding of unique customer identification as a watermark into data is called fingerprinting to… (More)

- Johannes Ueberberg
- AISMC
- 1994

- Albrecht Beutelspacher, Johannes Ueberberg
- Eur. J. Comb.
- 1991

- Johannes Ueberberg
- Discrete Mathematics
- 1997

- Johannes Ueberberg
- Eur. J. Comb.
- 1997

In P G(2, q 2), q a prime power, we study the set T of Baer subplanes that contain a fixed triangle P QR. To construct a linear rank 2–geometry over T , we determine the dihedral groups, their orders and possible extensions that are generated by the involutions of two Baer subplanes of T. If q +1 is an odd prime, the (q +1) 2 Baer subplanes through the… (More)

- Albrecht Beutelspacher, Johannes Ueberberg
- ACM SIGSAM Bulletin
- 1993

- Albrecht Beutelspacher, Johannes Ueberberg
- ACM SIGSAM Bulletin
- 1993

In the past, the computer has been used in geometry largely in order to solve particular problems of construction or non-existence.

- Johannes Ueberberg
- AISMC
- 1996

Given a finite field F = GF (q n) of order q n it is well-known that the map f : F → F , f : x → x q is a field automorphism of F of order n, called the Frobenius automor-phism. If V is an n-dimensional vector space over the finite field GF (q), then V can be considered as the vector space of the field GF (q n) over GF (q). Therefore the Frobenius… (More)