Epochal Signatures for Deniable Group Chats

Epochal Signatures for Deniable Group Chats
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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:
2021 IEEE Symposium on Security and Privacy (SP)
影响因子:
--
通讯作者:
F. Weber
F. Weber
中科院分区:
--
文献类型:
--
作者:
Andreas Hülsing;F. Weber

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在这项工作中,我们对群聊应用中的可否认性进行了形式化的研究,并引入了“划时代签名”的概念,它允许将许多安全的群聊协议变成可否认的协议。直观地说,该转换适用于使用签名进行身份验证并且在删除签名后变得不可否认的协议。与之前使用签名进行实体认证的建议不同,如mpOTR(CCS‘09),我们的构造不需要参与者的成对密钥建立,并且允许添加和删除参与者而不需要重新初始化聊天。这些属性允许在协议中进行部署,这些协议也被设计为可扩展到非常大的组。最后,我们利用通用原语构造了一个实用的划时代签名方案,并证明了它是安全的。
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.
具有对话完整性和可否认性的端到端安全移动群组消息传递
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: --
作者:
Schliep, Michael;Hopper, Nicholas
通讯作者: Hopper, Nicholas