Page 254 - Trust in ICT 2017

5 Trust in ICT

Figure 2 – Attributes related to trustworthiness

7.1.2 Indirect trust
Indirect trust is formed from the self-judgment about the situation and third party reputations. Unlike direct
trust, indirect trust is derived via the experience gained through previous conversations with the trustee and
the reputation gained through the global views on the trustee, respectively. This is particularly important in
a circumstance where information to estimate trustworthiness attributes are not available at first-hand.
– Experience
The experience represents a personal observation considering only interactions from a trustor to a trustee.
Experience is achieved by accumulating state of the interactions among entities over time. The left hand side
of Figure 3 illustrates how the trust based on experience is formed between the trustor and the trustee using
the previous interactions between the two.
– Reputation

Reputation is a public assessment of the trustor regarding the trustee’s prior behaviour and performance.
Reputation can be evaluated based on accumulated experiences of trustors about the trustee as shown in
the right hand side of Figure 3. To acquire trust information based on the reputation of a trustee, two kinds
of information are necessary to examine: (i) the previous trust transactions from all entities to the trustee;
and (ii) the relationship between a trustor to the trustee.

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