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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. The authors provide the first constructions of DAA in the standard model, that is, without relying on random oracles. As a building block for their schemes, they construct the first efficient standard-model signatures of knowledge, which have many applications beyond DAA.
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