Accountable Metadata-Hiding Escrow: A Group Signature Case Study

Accountable Metadata-Hiding Escrow: A Group Signature Case Study
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负责任的元数据隐藏托管:团体签名案例研究

DOI:
10.1515/popets-2015-0012
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发表时间:
2015
影响因子:
--
通讯作者:
Ian Miers
Ian Miers
中科院分区:
--
文献类型:
--
作者:
Markulf Kohlweiss;Ian Miers

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摘要 满足合法访问加密数据的要求的常见方法是允许受信任的第三方(TTP)访问私有数据。但是,无法验证这种信任是否正确,因为 TTP 可能会不加区别地打开所有消息。此外,当除了对话内容之外还希望隐藏自己的身份时,现有的方法就无法很好地扩展。鉴于元数据的重要性,这是一个主要问题。我们提出了一种新方法,用户可以通过加密方式追溯验证他们是否被窃听。作为一个案例研究,我们提出了一种新的签名方案,可以作为组签名、负责任的前向和后向跟踪签名的负责任的替代品。
Abstract A common approach to demands for lawful access to encrypted data is to allow a trusted third party (TTP) to gain access to private data. However, there is no way to verify that this trust is well placed as the TTP may open all messages indiscriminately. Moreover, existing approaches do not scale well when, in addition to the content of the conversation, one wishes to hide one’s identity. Given the importance of metadata this is a major problem. We propose a new approach in which users can retroactively verify cryptographically whether they were wiretapped. As a case study, we propose a new signature scheme that can act as an accountable replacement for group signatures, accountable forward and backward tracing signatures.
DOI: 10.1007/s10623-015-0062-x
发表时间: 2016-07-01
影响因子: 1.6
作者:
Hofheinz, Dennis;Jager, Tibor
通讯作者: Jager, Tibor