A new improved direct anonymous attestation scheme with enhanced anonymity

The Rudolph attacks, dictionary attacks in general password-based encrypted mechanism and replay attacks were analyzed in this paper. A new improved DAA scheme was proposed, it based on a bilinear pairing mechanism and Frequency Certificates, improved the JOIN and SIGNING protocol, and added a Trusted Synergic Third Party. The Trusted Synergic Third Party participated in generating public keys between TPM Host and Issuer, cooperating verify the identity, and generating signature certificate, meanwhile, ensuring uncomputing public keys and certificate by itself. According to these, the improved scheme avoided leaking the EK, enhanced anonymity and protects TPM identity, and was more efficient and safer than the original.