Aalto computer scientists in Asiacrypt 2024
Asiacrypt 2024, International Conference on the Theory and Application of Cryptology and Information Security, is organised by (IACR).
The conference will take place in Kolkata, India on 9-13 December 2024.
Accepted papers
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Authors
Chris Brzuska, Akin Ãœnal, Ivy K. Y. Woo
Abstract
The evasive LWE assumption, proposed by Wee [Eurocrypt'22 Wee] for constructing a lattice-based optimal broadcast encryption, has shown to be a powerful assumption, adopted by subsequent works to construct advanced primitives ranging from ABE variants to obfuscation for null circuits. However, a closer look reveals significant differences among the precise assumption statements involved in different works, leading to the fundamental question of how these assumptions compare to each other. In this work, we initiate a more systematic study on evasive LWE assumptions: (i) Based on the standard LWE assumption, we construct simple counterexamples against three private-coin evasive LWE variants, used in [Crypto'22 Tsabary, Asiacrypt'22 VWW, Crypto'23 ARYY] respectively, showing that these assumptions are unlikely to hold. (ii) Based on existing evasive LWE variants and our counterexamples, we propose and define three classes of plausible evasive LWE assumptions, suitably capturing all existing variants for which we are not aware of non-obfuscation-based counterexamples. (iii) We show that under our assumption formulations, the security proofs of [Asiacrypt'22 VWW] and [Crypto'23 ARYY] can be recovered, and we reason why the security proof of [Crypto'22 Tsabary] is also plausibly repairable using an appropriate evasive LWE assumption.
Authors
Michael Klooß, Russell W. F. Lai, Ngoc Khanh Nguyen, Michał Osadnik
Authors
Pedro Branco, Russell W. F. Lai, Monosij Maitra, Giulio Malavolta, Ahmadreza Rahimi, Ivy K. Y. Woo
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