Accountable Metadata-Hiding Escrow: A Group Signature Case Study

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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.
Original languageEnglish
Pages (from-to)206-221
Number of pages16
JournalWater Treatment Technology
Issue number2
Early online date22 Jun 2015
Publication statusE-pub ahead of print - 22 Jun 2015


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