Cryptology ePrint Archive: Report 2012/475

Efficient Signatures of Knowledge and DAA in the Standard Model

David Bernhard and Georg Fuchsbauer and Essam Ghadafi

Abstract: Direct Anonymous Attestation (DAA) is one of the most complex cryptographic protocols deployed in practice. It allows an embedded secure processor known as a Trusted Platform Module (TPM) to attest to the configuration of its host computer without violating the owner's privacy. DAA has been standardized by the Trusted Computing Group.

The security of the DAA standard and all existing schemes is analyzed in the random oracle model. We provide the first constructions of DAA in the standard model, that is, without relying on random oracles.

As a building block for our schemes, we construct the first efficient standard-model signatures of knowledge, which have many applications beyond DAA.

Category / Keywords: cryptographic protocols / DAA, group signatures, signatures of knowledge, standard model.

Date: received 17 Aug 2012

Contact author: ghadafi at cs bris ac uk

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Version: 20120818:040356 (All versions of this report)

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