International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Non-malleable Commitments Against Quantum Attacks

Nir Bitansky , TAU
Huijia Lin , UW
Omri Shmueli , TAU
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Conference: EUROCRYPT 2022
Abstract: We construct, under standard hardness assumptions, the first non-malleable commitments secure against quantum attacks. Our commitments are statistically binding and satisfy the standard notion of {\em non-malleability with respect to commitment}. We obtain a $\log^\star(\lambda)$-round classical protocol, assuming the existence of post-quantum one-way functions. Previously, non-malleable commitments with quantum security were only known against a restricted class of adversaries known as {\em synchronizing adversaries.} At the heart of our results is a new general technique that allows to modularly obtain non-malleable commitments from any extractable commitment protocol, obliviously of the underlying extraction strategy (black-box or non-black-box) or round complexity. The transformation may also be of interest in the classical setting.
Video from EUROCRYPT 2022
  title={Non-malleable Commitments Against Quantum Attacks},
  author={Nir Bitansky and Huijia Lin and Omri Shmueli},