Abstract: In a distributed computing environment how to establish a trust relationship between entities has been a hot issues for information security, and remote attestation provides a new research direction for solving the issues. Remote attestation is an important feature of trusted computing, and entities can establish trust relationship by using the remote attestation. However, some static remote attestation methods such as binary based attestation arc obviously inadequate to attest the trustworthiness of computing platform. They don't provide sufficient evidence in establishing trust relationship. Therefore, this paper used behavior-based attestation method to prove the trustworthiness of computing platform. This method can provide more accurate empirical results for establishing trust relationship. In additional, there are some uncertainties in behavior-based attestation, and these uncertainties will affect the establishment and evaluation of trust relationship. This paper used subjective logic to measure the trust relationship and build the dynamic trust model TMBA. This model can analyse dynamics of trust relationship by considering the past and present empirical results which arc collected from behavior-based attestation, and represent the trust degree with the trust point in subjective logic. Finally, the method for calculation of the trust point was given.

Key words: Trusted computing, Remote attestation, Trust relationship, Trust model