Cryptology ePrint Archive: Report 2014/824

Accountable Tracing Signatures

Markulf Kohlweiss and Ian Miers

Abstract: Demands for lawful access to encrypted data are a long standing obstacle to integrating cryptographic protections into communication systems. A common approach 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 place 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 ones identity. Given the importance of metadata this is a major problem. We propose a new signature scheme as an accountable replacement for group signatures, accountable forward and backward tracing signatures.

Category / Keywords: public-key cryptography / group signature

Date: received 10 Oct 2014

Contact author: imiers at cs jhu edu

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Version: 20141012:005443 (All versions of this report)

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