Epochal Signatures for Deniable Group Chats
Epochal Signatures for Deniable Group Chats
复制标题
可否认群聊的纪元签名
DOI:
10.1109/sp40001.2021.00058
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
F. Weber
中科院分区:
文献类型:
--
作者:
Andreas Hülsing;F. Weber
In this work we take a formal look at deniability in group chat applications and introduce the concept of "epochal signatures" that allows to turn many secure group chat protocols into deniable ones. Intuitively, the transform works for protocols that use signatures for authentication and that become deniable if the signatures are removed. In contrast to previous proposals that use signatures for entity authentication, like mpOTR (CCS’09), our construction does not require pairwise key establishment of participants and allows to add and remove participants without requiring to re-initialize the chat. These properties allow the deployment in protocols that are also designed to scale to very large groups. Finally, we construct a practical epochal signature scheme from generic primitives and prove it secure.
DOI:
10.1145/3338498.3358644
发表时间:
2019
期刊:
Proceedings of the 18th ACM Workshop on Privacy in the Electronic Society
影响因子:
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作者:
Schliep, Michael;Hopper, Nicholas
通讯作者:
Hopper, Nicholas