Introduction

[1] Trust is first of all a mental state, an attitude towards another agent (usually a social attitude). Delegation necessarily is an action, a result of a decision, and it also creates and is a (social) relation among X, Y, and the action A.

TBD

Considerations on UMA Trust Model

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Bootstrapping Trust is the fundamental phase where the subject builds his (trust) mental state towards other agent (Host, AM), evaluating the trustworthiness factors.

Evaluating data sharing trust

UMA Data sharing process is based on three actions of delegation:

• Access
• Authorization
• Consent

Delegation can be represented as a vector in a Cartesian plan (X-axes: Level of trustworthiness between the delegator and delegated agent, Y-axes: level of delegation, based on the iterative process of the protocol), which has initial point (delegator), a terminal point (delegated agent), a length and a direction.