Schloss Dagstuhl - Leibniz-Zentrum für Informatik GmbH Schloss Dagstuhl - Leibniz-Zentrum für Informatik GmbH scholarly article en Arditti, David; Berbain, Côme; Billet, Olivier; Gilbert, Henri; Patarin, Jacques License
when quoting this document, please refer to the following
URN: urn:nbn:de:0030-drops-10155

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QUAD: Overview and Recent Developments



We give an outline of the specification and provable security
features of the QUAD stream cipher proposed at Eurocrypt 2006.
The cipher relies on the iteration of a multivariate system of quadratic
equations over a finite field, typically GF(2) or a small extension. In the
binary case, the security of the keystream generation can be related, in
the concrete security model, to the conjectured intractability of the MQ
problem of solving a random system of m equations in n unknowns. We
show that this security reduction can be extended to incorporate the key
and IV setup and provide a security argument related to the whole stream
cipher.We also briefly address software and hardware performance issues
and show that if one is willing to pseudorandomly generate the systems
of quadratic polynomials underlying the cipher, this leads to suprisingly
inexpensive hardware implementations of QUAD.

BibTeX - Entry

  author =	{Arditti, David and Berbain, C\^{o}me and Billet, Olivier and Gilbert, Henri and Patarin, Jacques},
  title =	{{QUAD: Overview and Recent Developments}},
  booktitle =	{Symmetric Cryptography},
  pages =	{1--20},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2007},
  volume =	{7021},
  editor =	{Eli Biham and Helena Handschuh and Stefan Lucks and Vincent Rijmen},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{},
  URN =		{urn:nbn:de:0030-drops-10155},
  doi =		{10.4230/DagSemProc.07021.9},
  annote =	{Keywords: MQ problem, stream cipher, provable security, Gr\~{A}ƒ\^{A}¶bner basis}

Keywords: MQ problem, stream cipher, provable security, Gröbner basis
Seminar: 07021 - Symmetric Cryptography
Issue date: 2007
Date of publication: 06.06.2007

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