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Quantum-Access Security of the Winternitz One-Time Signature Scheme

Authors Christian Majenz , Chanelle Matadah Manfouo , Maris Ozols

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Author Details

Christian Majenz
  • Centrum Wiskunde & Informatica and QuSoft, Amsterdam, The Netherlands
Chanelle Matadah Manfouo
  • African Institute for Mathematical Science & Quantum Leap Africa, Kigali, Rwanda
Maris Ozols
  • Institute for Logic, Language, and Computation, Korteweg-de Vries Institute for Mathematics, and Institute for Theoretical Physics, University of Amsterdam and QuSoft, Amsterdam, The Netherlands


The authors thank anonymous reviewers for insightful comments and Stacey Jeffery for helpful discussions. CMM deeply thanks the African Institute for Mathematical Sciences, Quantum Leap Africa Rwanda, and QuSoft Amsterdam for their support.

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Christian Majenz, Chanelle Matadah Manfouo, and Maris Ozols. Quantum-Access Security of the Winternitz One-Time Signature Scheme. In 2nd Conference on Information-Theoretic Cryptography (ITC 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 199, pp. 21:1-21:22, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2021)


Quantum-access security, where an attacker is granted superposition access to secret-keyed functionalities, is a fundamental security model and its study has inspired results in post-quantum security. We revisit, and fill a gap in, the quantum-access security analysis of the Lamport one-time signature scheme (OTS) in the quantum random oracle model (QROM) by Alagic et al. (Eurocrypt 2020). We then go on to generalize the technique to the Winternitz OTS. Along the way, we develop a tool for the analysis of hash chains in the QROM based on the superposition oracle technique by Zhandry (Crypto 2019) which might be of independent interest.

Subject Classification

ACM Subject Classification
  • Theory of computation → Quantum information theory
  • Security and privacy → Digital signatures
  • Security and privacy → Information-theoretic techniques
  • quantum cryptography
  • one-time signature schemes
  • quantum random oracle model
  • post-quantum cryptography
  • quantum world
  • hash-based signatures
  • information-theoretic security


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