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Paper: Redeeming Reset Indifferentiability and Applications to Post-Quantum Security

Authors: Mark Zhandry , Princeton University and NTT Research DOI: 10.1007/978-3-030-92062-3_18 Search ePrint Search Google ASIACRYPT 2021 Indifferentiability is used to analyze the security of constructions of idealized objects, such as random oracles or ideal ciphers. Reset indifferentiability is a strengthening of plain indifferentiability which is applicable in far more scenarios, but has largely been abandoned due to significant impossibility results and a lack of positive results. Our main results are: - Under \emph{weak} reset indifferentiability, ideal ciphers imply (fixed size) random oracles, and domain shrinkage is possible. We thus show reset indifferentiability is more useful than previously thought. - We lift our analysis to the quantum setting, showing that ideal ciphers imply random oracles under quantum indifferentiability. - Despite Shor's algorithm, we observe that generic groups are still meaningful quantumly, showing that they are quantumly (reset) indifferentiable from ideal ciphers; combined with the above, cryptographic groups yield post-quantum \emph{symmetric} key cryptography. In particular, we obtain a plausible post-quantum random oracle that is a subset-product followed by two modular reductions.
BibTeX
@inproceedings{asiacrypt-2021-31354,
title={Redeeming Reset Indifferentiability and Applications to Post-Quantum Security},
publisher={Springer-Verlag},
doi={10.1007/978-3-030-92062-3_18},
author={Mark Zhandry},
year=2021
}