Abstract: In trust management existing delegation authorization models were not involved with the definition of trust relations and the trustworthiness measurements among entities, such as roles and anonymous users, and a fine-grained formalized model and relevant delegation authorization security protocols were also absent, as could not effectively satisfy the requirements of trust management system applications. A trust management oriented formalized model that depicts trust relationships among entities,which is called DAM for TM,was presented and trustworthiness measurement metrics of entities could be dynamically adjusted through introducing the trust punishment function. Also, the trust computing-enabling trust delegation and role delegation security protocols,and an application case in P2P security were also addressed. The case shows that the proposed model and security protocols constructed peers' trust delegation reladons, and ensured the security of computing platforms and shared resources by the remote attestation on the terminal mtegmty.

Key words: Trust management, Delegation authorization, Remote attestation, Peer-to-Peer security