Cryptology ePrint Archive: Report 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.
Category / Keywords: cryptographic protocols / Deniability, Signature, Epochal Signature, Group Chat
Original Publication (with minor differences): IEEE S&P 2021
Date: received 18 Sep 2020, last revised 5 Jan 2021
Contact author: mail at florianjw de, andreas@huelsing net
Available format(s): PDF | BibTeX Citation
Version: 20210105:154728 (All versions of this report)
Short URL: ia.cr/2020/1138
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