Growth of the ideal generated by a quadratic boolean function

  • Authors:
  • Jintai Ding;Timothy J. Hodges;Victoria Kruglov

  • Affiliations:
  • Department of Mathematical Sciences, University of Cincinnati, Cincinnati, OH;Department of Mathematical Sciences, University of Cincinnati, Cincinnati, OH;Department of Mathematical Sciences, University of Cincinnati, Cincinnati, OH

  • Venue:
  • PQCrypto'10 Proceedings of the Third international conference on Post-Quantum Cryptography
  • Year:
  • 2010

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Abstract

We give exact formulas for the growth of the ideal Aλ for λ a quadratic element of the algebra of Boolean functions over the Galois field GF(2). That is, we calculate $\dim A_k \lambda$ where Ak is the subspace of elements of degree less than or equal to k. These results clarify some of the assertions made in the article of Yang, Chen and Courtois [22,23] concerning the efficiency of the XL algorithm.