Page 270 - Trust in ICT 2017

5 Trust in ICT

III.2.3 Service flow

Figure III.4 – Smart office service flow

 Detailed flow description (Figure III.4)
1) Users request to use office facilities.
2) Office facilities request the validation of users and user’s trust information.

3) Facility management requests user’s information including trust index.
4) A trust information provider evaluates user’s trust index after analysing user data gathered.
5) Based on the user’s trust index, facility management decides the user’s trust level and the usage
right on each facilities and functions for a user.

III.3 Document sharing service

III.3.1 Description
This use case considers a social internet of things (IoT) environment with no centralized trusted authority. In
the social IoT, each device has the subjective value based on the owner's social relationship as well as the
community of interest [b-Bao] of each device. This use case focuses on using the social trust when sharing
the document between co-workers. Without the social IoT trust, a document owner takes the document
from own storage, sends the document to receiver and notifies a guest account to receiver. However, the
document owner does not need to do anything with the social IoT trust. A trust management platform
calculates the trust value using the collected social data from intermediate entity (e.g., smartphone) of co-
workers and then, these trust value will be used to judge whether a receiver has enough authorization to get
the document or not. Figure III.5 shows high level illustration for document sharing service.

III.3.2 Actors
– User: a user who takes the ownership of the things (e.g., wireless portable hard drive and
smartphone, etc.) and wants to share the documents in the wireless portable hard drive.
– Smartphone: a device which is an intermediate entity and is available to send its owner’s social
relationship information and its community of interest information to wireless portable hard drive.
– Trust information provider: this is mainly in charge of collecting the social relationship and
calculating the trust index.
– Wireless portable hard drive: a device, which is mainly in charge of judging authorization to share
the document.

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