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2019 | OriginalPaper | Chapter

How to Record Quantum Queries, and Applications to Quantum Indifferentiability

Author : Mark Zhandry

Published in: Advances in Cryptology – CRYPTO 2019

Publisher: Springer International Publishing

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Abstract

The quantum random oracle model (QROM) has become the standard model in which to prove the post-quantum security of random-oracle-based constructions. Unfortunately, none of the known proof techniques allow the reduction to record information about the adversary’s queries, a crucial feature of many classical ROM proofs, including all proofs of indifferentiability for hash function domain extension.

In this work, we give a new QROM proof technique that overcomes this “recording barrier”. We do so by giving a new “compressed oracle” which allows for efficient on-the-fly simulation of random oracles, roughly analogous to the usual classical simulation. We then use this new technique to give the first proof of quantum indifferentiability for the Merkle-Damgård domain extender for hash functions. We also give a proof of security for the Fujisaki-Okamoto transformation; previous proofs required modifying the scheme to include an additional hash term. Given the threat posed by quantum computers and the push toward quantum-resistant cryptosystems, our work represents an important tool for efficient post-quantum cryptosystems.

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previous chapter Low-Memory Attacks Against Two-Round Even-Mansour Using the 3-XOR Problem

next chapter Quantum Security Proofs Using Semi-classical Oracles

The one exception we are aware of is Unruh’s adaptive programming [Unr15]. This proof does change the oracle adaptively, but only inputs for which adversary’s queries have only negligible “weight”. Thus, the change is not detectable. The following discussion also applies to Unruh’s technique.

We note that if the underlying building blocks are strengthened, Fiat-Shamir was proven secure by Unruh [Unr16].

and the square root comes from the fact that the norm of the sum of q unit vectors of disjoint support is \(\sqrt{q}\).

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Title: How to Record Quantum Queries, and Applications to Quantum Indifferentiability
Author: Mark Zhandry
Publisher: Springer International Publishing
Book: Advances in Cryptology – CRYPTO 2019
Print ISBN: 978-3-030-26950-0

Electronic ISBN: 978-3-030-26951-7

Copyright Year: 2019
DOI: https://doi.org/10.1007/978-3-030-26951-7_9

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