On Boolean functions which are bent and negabent

  • Authors:
  • Matthew G. Parker;Alexander Pott

  • Affiliations:
  • The Selmer Center, Department of Informatics, University of Bergen, Bergen, Norway;Institute for Algebra and Geometry, Faculty of Mathematics, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany

  • Venue:
  • SSC'07 Proceedings of the 2007 international conference on Sequences, subsequences, and consequences
  • Year:
  • 2007

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Abstract

Bent functions f : F2m → F2 achieve largest distance to all linear functions. Equivalently, their spectrum with respect to the Hadamard-Walsh transform is flat (i.e. all spectral values have the same absolute value). That is equivalent to saying that the function f has optimum periodic autocorrelation properties. Negaperiodic correlation properties of f are related to another unitary transform called the nega-Hadamard transform. A function is called negabent if the spectrum under the nega-Hadamard transform is flat. In this paper, we consider functions f which are simultaneously bent and negabent, i.e. which have optimum periodic and negaperiodic properties. Several constructions and classifications are presented.