Overview
The DAA protocol is based on three entities and two different steps. The entities are the TPM platform, the DAA Issuer and the DAA verifier. The issuer is charged to verify the TPM platform during the Join step and to issue DAA credential to the platform. The platform uses the DAA credential with the verifier during the Sign step. Through a zero-knowledge proof the verifier can verify the credential without attempting to violate the platform's privacy. The protocol also supports a blacklisting capability so that verifiers can identify attestations from TPMs that have been compromised.
Read more about this topic: Direct Anonymous Attestation