Epochal Signatures for Deniable Group Chats

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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: Deniability Signature Epochal Signature Group Chat
Contact author(s): mail @ florianjw de
andreas @ huelsing net
History: 2023-09-25: last of 5 revisions; 2020-09-21: received; See all versions
Short URL: https://ia.cr/2020/1138
License: CC BY