A new DAA scheme from one-off public key

Direct Anonymous Attestation (DAA) is a kind of mechanism that enables remote direct anonymous authentication of a user in trusted computing. However, DAA is based on zero knowledge signature that leading to the processes of authentication is complicated. So in this paper, the improved scheme of one-off public key is proposed to realize the anonymous authentication of trusted computing in a simpler processes. The scheme of one-off public key has a key management problem and the security is not very well, so the combined public key (CPK) technology is used to expand the scheme´s key space and promote the safety of the whole scheme. The improved scheme can not only realize the direct and credible anonymous authentication of trusted computing, but also, if necessary, reveal the malicious users´ true identity with the help of a trusted third party .