Friday, September 24, 2021 3:30 pm
-
3:30 pm
EDT (GMT -04:00)
Title: Tightly-Secure Digital Signatures
| Speaker: | Tibor Jager |
| Affiliation: | University of Wuppertal, Germany |
| Zoom: | Please email Emma Watson |
Abstract:
This talk will cover two recent results on tightly-secure digital signature schemes from PKC 2021 and ASIACRYPT 2021.
The first part will consider a strong multi-user security definition for signatures with adaptive corruptions of secret keys, discuss its applications, and the technical challenges of constructing signatures with tight security in this setting. Then we will show a quite simple and efficient construction, based on sequential OR-proofs.
The second part will consider memory-tightness (as introduced by Auerbach et al. at CRYPTO 2017) and the possibility of constructing memory-tightly secure signatures in the multi-challenge setting.