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Small Public Keys and Fast Verification for \(\mathcal{M}\)ultivariate \(\mathcal{Q}\)uadratic Public Key Systems

  • Albrecht Petzoldt
  • Enrico Thomae
  • Stanislav Bulygin
  • Christopher Wolf
Part of the Lecture Notes in Computer Science book series (LNCS, volume 6917)

Abstract

Security of public key schemes in a post-quantum world is a challenging task—as both RSA and ECC will be broken then. In this paper, we show how post-quantum signature systems based on \(\mathcal{M}\)ultivariate \(\mathcal{Q}\)uadratic (\(\mathcal{MQ}\)) polynomials can be improved up by about 9/10, and 3/5, respectively, in terms of public key size and verification time. The exact figures are 88% and 59%. This is particularly important for small-scale devices with restricted energy, memory, or computational power. In addition, we provide evidence that this reduction does not affect security and that it is also optimal in terms of possible attacks. We do so by combining the previously unrelated concepts of reduced and equivalent keys. Our new scheme is based on the so-called Unbalanced Oil and Vinegar class of \(\mathcal{MQ}\)-schemes. We have derived our results mathematically and verified the speed-ups through a C++ implementation.

Keywords

Multivariate Quadratic Cryptography Post-Quantum Cryptography Implementation Unbalanced Oil and Vinegar Signature Scheme 

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Copyright information

© International Association for Cryptologic Research 2011

Authors and Affiliations

  • Albrecht Petzoldt
    • 1
  • Enrico Thomae
    • 2
  • Stanislav Bulygin
    • 1
  • Christopher Wolf
    • 2
  1. 1.Technische Universität Darmstadt and, Center for Advanced Security Research Darmstadt (CASED)Germany
  2. 2.Horst Görtz Institute for IT-security, Faculty of MathematicsRuhr-University of BochumBochumGermany

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