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- Hans Dobbertin, Gregor Leander, Anne Canteaut, Claude Carlet, Patrick Felke, Philippe Gaborit
- J. Comb. Theory, Ser. A
- 2006

A Boolean function with an even number n = 2k of variables is called bent if it is maximally nonlinear. We present here a new construction of bent functions. Boolean functions of the form f (x) = tr(α 1 x d1 + α 2 x d2), α 1 , α 2 , x ∈ F 2 n , are considered, where the exponents d i (i = 1, 2) are of Niho type, i.e. the restriction of x di on F 2 k is… (More)

- Lilya Budaghyan, Claude Carlet, Patrick Felke, Gregor Leander
- 2006 IEEE International Symposium on Information…
- 2005

We exhibit an infinite class of almost perfect nonlinear quadratic polynomials from F<sub>2n</sub> to F<sub>2n</sub> (n ges 12, n divisible by 3 but not by 9). We prove that these functions are EA-inequivalent to any power function and that they are CCZ-inequivalent to any Gold function. In a forthcoming full paper, we shall also prove that at least some of… (More)

- Nicolas Courtois, Magnus Daum, Patrick Felke
- IACR Cryptology ePrint Archive
- 2002

Quartz is a signature scheme based on an HFEv-trapdoor function published at Eurocrypt 1996. In this paper we study " inversion " attacks for Quartz, i.e. attacks that solve the system of multivariate equations used in Quartz. We do not cover some special attacks that forge signatures without inversion. We are interested in methods to invert the… (More)

- Kai Schramm, Gregor Leander, Patrick Felke, Christof Paar
- CHES
- 2004

Recently a new class of collision attacks which was originally suggested by Hans Dobbertin has been introduced. These attacks use side channel analysis to detect internal collisions and are generally not restricted to a particular cryptographic algorithm. As an example, a collision attack against DES was proposed which combines internal collisions with side… (More)

- Hans Dobbertin, Patrick Felke, Tor Helleseth, Petri Rosendahl
- IEEE Transactions on Information Theory
- 2006

Suppose that n=2k is even. We study the cross-correlation function between two m-sequences for Niho type decimations d=(2/sup k/-1)s+1. We develop a new technique to study the value distribution of these cross-correlation functions, which makes use of Dickson polynomials. As a first application, we derive here the distribution of the six-valued… (More)

- Patrick Felke
- IACR Cryptology ePrint Archive
- 2004

- Elisabeth Oswald, Norbert Stefan, +10 authors Jean-Didier
- 2005

- A. Bosselaers, A. Biryukov, +14 authors H. Gilbert
- 2003

This is the document identifying the problems faced by cryptographers and users of cryptology, either currently or in the short or medium term future. The information in this document is provided as is, and no warranty is given or implied that the information is fit for any particular purpose. The user thereof uses the information at its sole risk and… (More)

- A. Bosselaers, A. Biryukov, +13 authors H. Gilbert
- 2003

This documents states the research agenda for the future of cryptology. We show which areas deserve more research bridging the gap between applications and research. For more detailed problems see the STORK document " D6 – Open Problems in Cryptology ". The information in this document is provided as is, and no warranty is given or implied that the… (More)

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