Page 190 - Trust in ICT 2017
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3                                                    Trust in ICT




                                                           A Service Domain
                                                                           Multiple Trust Domains
                         ICT Infrastructure
                                              Trust Domain A  Trust Domain B  Trust Domain C
                           Social Domain
                                                                              Social
                               Social                                                     QoT
                             Component                                         Trust     Class 3


                           Cyber Domain
                                                                Cyber         Cyber      QoT
                               Cyber
                             Component                           Trust         Trust    Class 2

                          Physical Domain
                                                 Physical      Physical      Physical    QoT
                              Physical                                                  Class 1
                             Component            Trust         Trust          Trust
                                                                                       An Example
                                                                                       of Different
                           Level of Trust        Trust-based ICT Service through TLA    Classes of
                                 High                                                     QoT

                                 Low


                            Figure 7-2 – An example of QoT and TLA among multiple trust domains

            From the concepts of trust domains in the previous figure, Figure 7-3 illustrates several interactions among
            entities for trust provisioning in a real world. These interactions are based on trust relationships of each entity
            in social, cyber and physical domains according to different classes of QoT.





























                   Figure 7-3 – Illustration of interactions among entities for trust provisioning in a real world

            7.3     Key challenges for trust provisioning

            This clause describes key challenges for trust provisioning for ICT infrastructures.

            Trust relationship may be human to human, object to object (e.g., handshake protocols negotiated), human
            to object (e.g., when a consumer reviews a digital signature advisory notice) or object to human (e.g., when




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