Concatenating Indicators of Flats for Designing Cryptographic Functions

  • Authors:
  • Claude Carlet

  • Affiliations:
  • Project Codes, INRIA, university of Paris 8, (MAATICAH), Cedex, France

  • Venue:
  • Designs, Codes and Cryptography
  • Year:
  • 2005

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Abstract

Boolean functions with good cryptographic characteristics are needed for the design of robust pseudo-random generators for stream ciphers and of S-boxes for block ciphers. Very few general constructions of such cryptographic Boolean functions are known. The main ones correspond to concatenating affine or quadratic functions. We introduce a general construction corresponding to the concatenation of indicators of flats. We show that the functions it permits to design can present very good cryptographic characteristics.