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Trust in ICT 3

Use case #3: Trustworthy document sharing service

This use case focuses on sharing the document among co-workers using social trust value among them. Trust
management platform estimates social trust values between co-workers by using the collected social data
from intermediate entities (e.g., smartphone) of co-workers and then, these values will be used to judge
whether the receiver has enough qualification to get the document or not. If the document receiver has
enough qualification to get the document, an entity transfers the document to receiver.

Use case #4: Device selection for data transmission

This use case focuses on selecting the device for data transmission in multi-hop Device-to-Device (D2D)
environment using social trust value among devices. Trust management platform calculates the trust value
using the collected social data from intermediate entities of users and then, these trust value will be used to
judge whether that device has enough reliability to receive and transmit data or not.
Use case #5: Trustworthy car sharing service

The car sharing service offers a new business model for automobile transportation. This use case is
particularly designed for two user groups – first of all, people who live in cities but do not drive a car every
day, and secondly tourists who travel in cities but do not bring their car. Thus, people who need a car at short
period can take this alternative without purchasing it. Trust management platform can provide the evaluated
trust levels of users or cars by using collected data of cars as well as users who use the car sharing service.

Use case #6: Trustworthy used car transaction service

This use case focuses on buying a used car in trustworthy procedure. Buying a used car involves high levels
of uncertainty and risk because there exists inevitable distrust in used car transactions between entities.
Trust management platform can play an important role in mediating entities who participate in a used vehicle
market by sharing trustworthy information between entities in a transaction. Trust management platform
evaluates each actor’s trust by collected data from various sources such as insurance company, public
organization, social network services, and vehicle itself.
NOTE – The detail features and operations of each use case are described in Appendix IV.

Table 10-1 summarizes six use cases discussed in Appendix IV. In Table 10-1, it is observed that the
uncertainty and risks can be mitigated by providing trust information.

Table 10-1 – Summary of use cases

No Use case Purpose Method Actors

1 Trustworthy Managing home Trustworthy home-related data − User
smart home facilities  Providing personal − Service provider
service information to service platform
− Service platform
− Home gateway
− Home appliance
2 Trustworthy Managing office Trust level of users  − User
smart office facilities Determining facility usage right − Smart office
service
− Smart office provider
− Trust mgmt. platform
3 Trustworthy Sharing document Trust level between users  − User A
document sharing with appropriate Determining authority of − A’s Device
service users accessing document
− User B

− B’ device
− Trust mgmt. platform

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