Paper 2020/1138
Epochal Signatures for Deniable Group Chats
Andreas Hülsing and Florian Weber
Abstract
We introduce formal definitions for deniability in group chats by extending a pre-existing model that did not have this property. We then introduce “epochal signatures” as an almost drop-in replacement for signatures, which can be used to make certain undeniable group-chats deniable by just performing that replacement. Following that we provide a practical epochal signature scheme and prove its security.
Metadata
- Available format(s)
-
PDF
- Category
- Cryptographic protocols
- Publication info
- Published elsewhere. MINOR revision.IEEE S&P 2021
- Keywords
- DeniabilitySignatureEpochal SignatureGroup Chat
- Contact author(s)
-
mail @ florianjw de
andreas @ huelsing net - History
- 2021-02-03: last of 3 revisions
- 2020-09-21: received
- See all versions
- Short URL
- https://ia.cr/2020/1138
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2020/1138, author = {Andreas Hülsing and Florian Weber}, title = {Epochal Signatures for Deniable Group Chats}, howpublished = {Cryptology ePrint Archive, Paper 2020/1138}, year = {2020}, note = {\url{https://eprint.iacr.org/2020/1138}}, url = {https://eprint.iacr.org/2020/1138} }