Paper 2025/946 Original: eprint.iacr.org/2025/946 ↗
Logup*: faster, cheaper logup argument for small-table indexed lookups
Abstract
Logup argument (in it's modern GKR version, as described in eprint:2023/1284 paper) is a logarithmic derivative-based unindexed lookup argument. An indexed lookup argument can be constructed from unindexed one using standard trick. In this short informal note, we explain a different way of obtaining indexed lookup from logup, which does not commit any additional arrays of the size of the indexing array. That makes it particularly amenable for lookups in small tables (giving, to our knowledge, a first argument with this property). Additionally, this argument is not subject to numerator overflow issue that requires additional mitigation described in eprint:2024/2067. Improvements to SPARK / Lasso protocols are also discussed.
Metadata
- Available format(s)
PDF- Category
- Cryptographic protocols
- Publication info
- Preprint.
- History
- 2025-05-24: last updated
- 2025-05-24: published
- Short URL
- https://ia.cr/2025/946
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2025/946,
author = {Lev Soukhanov},
title = {Logup*: faster, cheaper logup argument for small-table indexed lookups},
howpublished = {Cryptology {ePrint} Archive, Paper 2025/946},
year = {2025},
url = {https://eprint.iacr.org/2025/946}
}