On the algebraic immunity of symmetric boolean functions

  • Authors:
  • An Braeken;Bart Preneel

  • Affiliations:
  • Dept. Elect. Eng.-ESAT/SCD-COSIC, Katholieke Universiteit Leuven, Heverlee, Belgium;Dept. Elect. Eng.-ESAT/SCD-COSIC, Katholieke Universiteit Leuven, Heverlee, Belgium

  • Venue:
  • INDOCRYPT'05 Proceedings of the 6th international conference on Cryptology in India
  • Year:
  • 2005

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Abstract

In this paper, we analyze the algebraic immunity of symmetric Boolean functions. The algebraic immunity is a property which measures the resistance against the algebraic attacks on symmetric ciphers. We identify a set of lowest degree annihilators for symmetric functions and propose an efficient algorithm for computing the algebraic immunity of a symmetric function. The existence of several symmetric functions with maximum algebraic immunity is proven. In this way, we have found a new class of functions which have good implementation properties and maximum algebraic immunity.