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Documents authored by Unruh, Dominique

Document
DOI: 10.4230/LIPIcs.ISAAC.2022.26
How to Base Security on the Perfect/Statistical Binding Property of Quantum Bit Commitment?

Authors: Junbin Fang, Dominique Unruh, Jun Yan, and Dehua Zhou

Published in: LIPIcs, Volume 248, 33rd International Symposium on Algorithms and Computation (ISAAC 2022)

Abstract
The concept of quantum bit commitment was introduced in the early 1980s for the purpose of basing bit commitments solely on principles of quantum theory. Unfortunately, such unconditional quantum bit commitments still turn out to be impossible. As a compromise like in classical cryptography, Dumais et al. [Paul Dumais et al., 2000] introduce the conditional quantum bit commitments that additionally rely on complexity assumptions. However, in contrast to classical bit commitments which are widely used in classical cryptography, up until now there is relatively little work towards studying the application of quantum bit commitments in quantum cryptography. This may be partly due to the well-known weakness of the general quantum binding that comes from the possible superposition attack of the sender of quantum commitments, making it unclear whether quantum commitments could be useful in quantum cryptography. In this work, following Yan et al. [Jun Yan et al., 2015] we continue studying using (canonical non-interactive) perfectly/statistically-binding quantum bit commitments as the drop-in replacement of classical bit commitments in some well-known constructions. Specifically, we show that the (quantum) security can still be established for zero-knowledge proof, oblivious transfer, and proof-of-knowledge. In spite of this, we stress that the corresponding security analyses are by no means trivial extensions of their classical analyses; new techniques are needed to handle possible superposition attacks by the cheating sender of quantum bit commitments. Since (canonical non-interactive) statistically-binding quantum bit commitments can be constructed from quantum-secure one-way functions, we hope using them (as opposed to classical commitments) in cryptographic constructions can reduce the round complexity and weaken the complexity assumption simultaneously.
Cite as

Junbin Fang, Dominique Unruh, Jun Yan, and Dehua Zhou. How to Base Security on the Perfect/Statistical Binding Property of Quantum Bit Commitment?. In 33rd International Symposium on Algorithms and Computation (ISAAC 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 248, pp. 26:1-26:12, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@InProceedings{fang_et_al:LIPIcs.ISAAC.2022.26,
  author =	{Fang, Junbin and Unruh, Dominique and Yan, Jun and Zhou, Dehua},
  title =	{{How to Base Security on the Perfect/Statistical Binding Property of Quantum Bit Commitment?}},
  booktitle =	{33rd International Symposium on Algorithms and Computation (ISAAC 2022)},
  pages =	{26:1--26:12},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-258-7},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{248},
  editor =	{Bae, Sang Won and Park, Heejin},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ISAAC.2022.26},
  URN =		{urn:nbn:de:0030-drops-173112},
  doi =		{10.4230/LIPIcs.ISAAC.2022.26},
  annote =	{Keywords: Quantum bit commitment, quantum zero-knowledge, quantum proof-of-knowledge, quantum oblivious transfer}
}
Document
Track B: Automata, Logic, Semantics, and Theory of Programming
DOI: 10.4230/LIPIcs.ICALP.2021.136
Quantum Relational Hoare Logic with Expectations

Authors: Yangjia Li and Dominique Unruh

Published in: LIPIcs, Volume 198, 48th International Colloquium on Automata, Languages, and Programming (ICALP 2021)

Abstract
We present a variant of the quantum relational Hoare logic from (Unruh, POPL 2019) that allows us to use "expectations" in pre- and postconditions. That is, when reasoning about pairs of programs, our logic allows us to quantitatively reason about how much certain pre-/postconditions are satisfied that refer to the relationship between the programs inputs/outputs.
Cite as

Yangjia Li and Dominique Unruh. Quantum Relational Hoare Logic with Expectations. In 48th International Colloquium on Automata, Languages, and Programming (ICALP 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 198, pp. 136:1-136:20, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{li_et_al:LIPIcs.ICALP.2021.136,
  author =	{Li, Yangjia and Unruh, Dominique},
  title =	{{Quantum Relational Hoare Logic with Expectations}},
  booktitle =	{48th International Colloquium on Automata, Languages, and Programming (ICALP 2021)},
  pages =	{136:1--136:20},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-195-5},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{198},
  editor =	{Bansal, Nikhil and Merelli, Emanuela and Worrell, James},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICALP.2021.136},
  URN =		{urn:nbn:de:0030-drops-142058},
  doi =		{10.4230/LIPIcs.ICALP.2021.136},
  annote =	{Keywords: Quantum cryptography, Hoare logics, formal verification}
}
Document
DOI: 10.4230/DagRep.4.12.29
The Synergy Between Programming Languages and Cryptography (Dagstuhl Seminar 14492)

Authors: Gilles Barthe, Michael Hicks, Florian Kerschbaum, and Dominique Unruh

Published in: Dagstuhl Reports, Volume 4, Issue 12 (2015)

Abstract
Increasingly, modern cryptography (crypto) has moved beyond the problem of secure communication to a broader consideration of securing computation. The past thirty years have seen a steady progression of both theoretical and practical advances in designing cryptographic protocols for problems such as secure multiparty computation, searching and computing on encrypted data, verifiable storage and computation, statistical data privacy, and more. More recently, the programming-languages (PL) community has begun to tackle the same set of problems, but from a different perspective, focusing on issues such as language design (e.g., new features or type systems), formal methods (e.g., model checking, deductive verification, static and dynamic analysis), compiler optimizations, and analyses of side-channel attacks and information leakage. This seminar helped to cross-fertilize ideas between the PL and crypto communities, exploiting the synergies for advancing the development of secure computing, broadly speaking, and fostering new research directions in and across both communities.
Cite as

Gilles Barthe, Michael Hicks, Florian Kerschbaum, and Dominique Unruh. The Synergy Between Programming Languages and Cryptography (Dagstuhl Seminar 14492). In Dagstuhl Reports, Volume 4, Issue 12, pp. 29-47, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2015)

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@Article{barthe_et_al:DagRep.4.12.29,
  author =	{Barthe, Gilles and Hicks, Michael and Kerschbaum, Florian and Unruh, Dominique},
  title =	{{The Synergy Between Programming Languages and Cryptography (Dagstuhl Seminar 14492)}},
  pages =	{29--47},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2015},
  volume =	{4},
  number =	{12},
  editor =	{Barthe, Gilles and Hicks, Michael and Kerschbaum, Florian and Unruh, Dominique},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.4.12.29},
  URN =		{urn:nbn:de:0030-drops-50045},
  doi =		{10.4230/DagRep.4.12.29},
  annote =	{Keywords: Security, Theory, Languages}
}
Document
DOI: 10.4230/DagSemProc.07421.4
Zero-Knowledge in the Applied Pi-calculus and Automated Verification of the Direct Anonymous Attestation Protocol

Authors: Michael Backes, Matteo Maffei, and Dominique Unruh

Published in: Dagstuhl Seminar Proceedings, Volume 7421, Formal Protocol Verification Applied (2008)

Abstract
We devise an abstraction of zero-knowledge protocols that is accessible to a fully mechanized analysis. The abstraction is formalized within the applied pi-calculus using a novel equational theory that abstractly characterizes the cryptographic semantics of zero-knowledge proofs. We present an encoding from the equational theory into a convergent rewriting system that is suitable for the automated protocol verifier ProVerif. The encoding is sound and fully automated. We successfully used ProVerif to obtain the first mechanized analysis of the Direct Anonymous Attestation (DAA) protocol. The analysis in particular required us to devise novel abstractions of sophisticated cryptographic security definitions based on interactive games.
Cite as

Michael Backes, Matteo Maffei, and Dominique Unruh. Zero-Knowledge in the Applied Pi-calculus and Automated Verification of the Direct Anonymous Attestation Protocol. In Formal Protocol Verification Applied. Dagstuhl Seminar Proceedings, Volume 7421, pp. 1-43, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2008)

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@InProceedings{backes_et_al:DagSemProc.07421.4,
  author =	{Backes, Michael and Maffei, Matteo and Unruh, Dominique},
  title =	{{Zero-Knowledge in the Applied Pi-calculus and Automated Verification of the Direct Anonymous Attestation Protocol}},
  booktitle =	{Formal Protocol Verification Applied},
  pages =	{1--43},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2008},
  volume =	{7421},
  editor =	{Liqun Chen and Steve Kremer and Mark D. Ryan},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.07421.4},
  URN =		{urn:nbn:de:0030-drops-14153},
  doi =		{10.4230/DagSemProc.07421.4},
  annote =	{Keywords: Language-based security, zero-knowledge proofs, applied pi-calculus, direct anonymous attestation}
}
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