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Publication Detail
Algebraic Description and Simultaneous Linear Approximations of Addition in Snow 2.0.
  • Publication Type:
  • Authors:
    Courtois NT, Debraize B
  • Publisher:
    Springer Verlag
  • Publication date:
  • Place of publication:
    Berlin/ Heidelberg, Germany
  • Pagination:
    328, 344
  • Published proceedings:
    Information and Communications Security 10th International Conference, ICICS 2008 Birmingham, UK, October 20 - 22, 2008. Proceedings
  • Volume:
  • Series:
    Lecture Notes in Computer Science
  • Editors:
    Chen L,Ryan M,Wang G
  • ISBN-13:
  • Status:
  • Name of conference:
    ICICS 2008, 10th International Conference on Information and Communications Security
  • Conference place:
    Birmingham, UK
  • Conference start date:
  • Conference finish date:
  • Print ISSN:
  • Keywords:
    modular addition, multivariate quadratic equations, algebraic immunity, stream ciphers, Snow 2.0, algebraic cryptanalysis
In this paper we analyse the algebraic properties over the field GF(2) of the addition modulo 2pn. We look at implicit quadratic equations describing this operation, and at probabilistic conditional linear equations. We show that the addition modulo 2pn can be partly or totally linearized when the output is fixed, and this for a large family of outputs. We apply these results to analyse the resistance of the stream cipher Snow 2.0 against algebraic attacks.
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