An improved directed anonymous attestation scheme
Yao Cheng · Journal of Computer Applications · 2009
The research and development of direct anonymous attestation(DAA) was introduced.In cognizance of the Rudolph attack caused by the leak of EK in the existing scheme,an improved direct anonymous attestation scheme was proposed.Compared with the original scheme,the improved one presented a new key exchange protocol,which implemented the two-way identity authentication between DAA Issuer and Prover.The authentication of the EK certificate and the process of issuing DAA certificate were separated from each other,so the potential attack mentioned above was avoided.The key exchange protocol in the improved scheme was analyzed by using the CK model,which showed that the protocol had reached the SK-security level.The improved scheme ensures the user controlled anonymity and the trusted third party will not be the bottle-neck of the scheme.