Direct Anonymous Attestation

Brickell, Ernie ; Camenisch, Jan ; Chen, Liqun

HP Development Company

关键词: direct anonymous attestation;    DAA;    trusted computing;    group signatures;   

RP-ID  :  HPL-2004-93

学科分类：计算机科学（综合）

美国|英语

来源: HP Labs

【 摘 要 】

This paper describes the direct anonymous attestation scheme (DAA). This scheme was adopted by the Trusted Computing Group as the method for remote authentication of a hardware module, called trusted platform module (TPM), while preserving the privacy of the user of the platform that contains the module. Direct anonymous attestation can be seen as a group signature without the feature that a signature can be opened, i.e., the anonymity is not revocable. Moreover, DAA allows for pseudonyms, i.e., for each signature a user (in agreement with the recipient of the signature) can decide whether or not the signature should be linkable to another signature. DAA furthermore allows for detection of "known" keys: if the DAA secret keys are extracted from a TPM and published, a verifier can detect that a signature was produced using these secret keys. The scheme is provably secure in the random oracle model under the strong RSA and the decisional Diffie-Hellman assumption. Notes: Ernie Brickell, Intel Corporation Jan Camenisch, IBM Research 30 Pages