Page 272 - Trust in ICT 2017

5 Trust in ICT

6) If the trust index exceeds the threshold value,

6.1) The hard drive sends the document to User B's smartphone.
6.2) The smartphone notifies result to User B.
7) If the trust index is lower than the threshold value,
7.1) The hard drive notifies that the request was denied.
7.2) The smartphone notifies result to User B.

III.4 Intermediate device selection in device-to-device environment
III.4.1 Description

This use case focuses on using the social trust when selecting the device for data transmission in multi-hop
device-to-device environment. Reliable transmission is possible by using social information in the process of
device-to-device communication. Trust information provider calculates the trust index by using the collected
social data from intermediate entities (e.g., smartphone) of users and then, this trust index will be used to
judge whether that device has enough authorization to send information or not. The social IoT trust also can
be used in the device selection process for the reliable exchange of information. Figure III.4 shows high level
illustration for intermediate device selection scenario in device-to-device environment.

Figure III.7 – High level illustration for intermediate device selection

III.4.2 Actors
– User: A user who takes the ownership of the things (e.g., smartphone and laptop, etc.) and wants
to exchange information with another peer via other users.
– Device (Smartphone): A device, which is an intermediate entity, is available to send its owner’s social
relationship information and its community of interest information to other devices. Also, it is in
charge of judging authorization to send information.
– Trust information provider: this is mainly in charge of collecting the social information and
calculating the trust index.

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