[Resource Topic] 2019/262: Revisiting Post-Quantum Fiat-Shamir

Welcome to the resource topic for 2019/262

Title:
Revisiting Post-Quantum Fiat-Shamir

Authors: Qipeng Liu, Mark Zhandry

Abstract:

The Fiat-Shamir transformation is a useful approach to building non-interactive arguments (of knowledge) in the random oracle model. Unfortunately, existing proof techniques are incapable of proving the security of Fiat-Shamir in the quantum setting. The problem stems from (1) the difficulty of quantum rewinding, and (2) the inability of current techniques to adaptively program random oracles in the quantum setting. In this work, we show how to overcome the limitations above in many settings. In particular, we give mild conditions under which Fiat-Shamir is secure in the quantum setting. As an application, we show that existing lattice signatures based on Fiat-Shamir are secure without any modifications.

ePrint: https://eprint.iacr.org/2019/262

Talk: https://www.youtube.com/watch?v=2WIqyfATL1o

See all topics related to this paper.

Feel free to post resources that are related to this paper below.

Example resources include: implementations, explanation materials, talks, slides, links to previous discussions on other websites.

For more information, see the rules for Resource Topics .