Page 39 - Trust in ICT 2017

Trust in ICT 1

5.2.9.2 Actor list

Users: A user who takes the ownership of the shared things which are car.
Sensors (or Sensor Devices): Sensor Devices can be various based on its usage, and do not have any direct
communication interfaces to the service platform.
Smartphone: A device which is an intermediate entity and is available to connect from sensors to a service
platform. The basic role is similar to the general gateway, but it has some sensors and some applications
(navigation) itself used by services.
Service Platform: In charge of providing common functionalities for the services. It is mainly in charge of
collecting the status and configuration information of sensors and controlling them via the smartphone
and/or gateway.
Service Providers: Companies which provide its own services for the user through the service platform. The
service providers can be various according to the types of services.
5.2.9.3 Trigger

A user wants to take an ownership of the car.
5.2.9.4 Pre-conditions

The user preliminary joins a membership of the car sharing service.
Sensors built in the car are required to periodically (normal) and non-periodically (urgent) send sensor data
to the service platform based on the trigger defined by the service providers.
The service platform collects and manages data and configurations related to the services. Generally, each
service has its own data and configuration set, simply called resources.
The service providers in the service domain have a service agreement each other for unified services.

The Smartphone has a navigation and car sharing application.

5.2.9.5 Analysis
Trusted data collection and aggregation
Data should be trustworthy from devices (sensors) to gateway (smartphone) service platform. Devices
produce data, and data is collected in a service platform. And, data is transmitted from service platform to
devices. Devices report their status to the service platform via gateway. When data is produced and
transmitted to other entity, trustworthiness of data is required to be maintained.

Trusted data process and analysis

Information which is processed by service platform and application should be trustworthy. Applications send
registration information with proper access right of the resources and grant that request to service platform.
Service platform detects changed status by processing collected data from devices and notifies to
applications. Service platform provides payment information to applications. Since the gateway and service
platform manipulate collected data, the trustworthiness of information (i.e. processed and analysed data) is
required to be maintained in each process.

Trustworthy application
Car sharing system use case has multiple service providers (applications), so trustworthy application and
interactions between applications are important. Two applications exchange data and information (e.g.
location information, transaction information, etc.) to provide proper services. Since applications handle
many data and information, the trustworthiness of application is required to be maintained in each process
Privacy: user profile information is used to find authorized user. User’s payment information is propagated
to service platform and applications. User profile and payment information contains many user privacy data

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