March 8, 2021

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Quantum Lazy Sampling and Game-Playing Proofs for Quantum Indifferentiability. (arXiv:1904.11477v3 [quant-ph] UPDATED)

Game-playing proofs constitute a powerful framework for non-quantum
cryptographic security arguments, most notably applied in the context of
indifferentiability. An essential ingredient in such proofs is lazy sampling of
random primitives. We develop a quantum game-playing proof framework by
generalizing two recently developed proof techniques. First, we describe how
Zhandry’s compressed quantum oracles~(Crypto’19) can be used to do quantum lazy
sampling of a class of non-uniform function distributions. Second, we observe
how Unruh’s one-way-to-hiding lemma~(Eurocrypt’14) can also be applied to
compressed oracles, providing a quantum counterpart to the fundamental lemma of
game-playing. Subsequently, we use our game-playing framework to prove quantum
indifferentiability of the sponge construction, assuming a random internal
function.