Trust Management related concepts

1. Main body

A subject is an individual or group composed of a person or a mixture of people and objects. The trust between the subjects is subjective trust. Subjective trust is a kind of human cognition phenomenon, which is the subjective judgment of the specific characteristics of the subject and the specific level of the behavior, which is independent of the subject characteristics and behavior monitoring.

Subjective trust is the important premise and foundation of trusting relationship, which is based on faith, has great subjectivity and fuzziness, and cannot be accurately described and verified.

The initial stage of trust management is based on the trust system of credential (i.e. policy and certificate), and the advanced stage should be subjective trust management, that is, trust system based on reputation and fuzzy logic processing.

2. Trust

Most trust definitions depend on the context in which the interaction occurs, or on the observer's subjective point of view. A formal Description:

A trust B to perform P, when: 1) A is willing to trust B to perform p;2) in case B does not perform p,a knows it will suffer losses; 3) A to B the trust of the ability or willingness to perform p is relatively unstable.

Trust contains risks.

3. Trust Metrics

4. Trust relationship

Direct Trust relationship: A has a degree of trust in B with respect to a certain trust purpose;

Indirect trust relationship: A has a trust degree to B for a certain trust purpose of Target principal C, B is the referrer, A to B has the recommendation Trust degree, A to C has indirect trust.

5. Trust Management

A unified approach is used to describe and interpret security policies, security credentials, and trust relationships for direct authorization of critical security operations.

Formal representation is: Whether security voucher set C can prove that the request R satisfies the local policy set p.

Trust Management related concepts