[Resource Topic] 2016/015: Quantum Collision-Resistance of Non-Uniformly Distributed Functions

Welcome to the resource topic for 2016/015

Title:
Quantum Collision-Resistance of Non-Uniformly Distributed Functions

Authors: Ehsan Ebrahimi Targhi, Gelo Noel Tabia, Dominique Unruh

Abstract:

We study the quantum query complexity of finding a collision for a function f whose outputs are chosen according to a distribution with min-entropy k. We prove that \Omega(2^{k/9}) quantum queries are necessary to find a collision for function f. This is needed in some security proofs in the quantum random oracle model (e.g. Fujisaki-Okamoto transform).

ePrint: https://eprint.iacr.org/2016/015

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