An Efficient Direct Anonymous Attestation without Encryption

Abstract

DAA (Direct Anonymous Attestation) schemes are generally employed with the hardware of TPM to realize anonymous authentication. Basically, DAA schemes are based on group signatures. We propose a new DAA scheme based on a short group signature without encryption which departs from the traditional sign-encrypt-prove paradigm, only adopts an anonymous signature and non-interactive zero knowledge(NIZK) proofs. Compared to other DAA schemes at present, our scheme is approximately the most efficient and computational cost-saving with shorter signature length and easier signature generation. Our scheme also satisfies anonymity, trace ability and non-frame ability requirements.