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QUAD: Overview and Recent Developments

Authors: David Arditti, Côme Berbain, Olivier Billet, Henri Gilbert, and Jacques Patarin

Published in: Dagstuhl Seminar Proceedings, Volume 7021, Symmetric Cryptography (2007)

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.

Cite as

David Arditti, Côme Berbain, Olivier Billet, Henri Gilbert, and Jacques Patarin. QUAD: Overview and Recent Developments. In Symmetric Cryptography. Dagstuhl Seminar Proceedings, Volume 7021, pp. 1-20, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2007)

Copy BibTex To Clipboard

  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}
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