Page 276 - Trust in ICT 2017

5 Trust in ICT

– Dealer: The major role of a dealer is mediating buyer and seller (owner) to gain economic profit. A
dealer can sell the possessed cars, which were already purchased, or can mediate the transaction
between sellers and buyers.
– Buyer: A buyer is someone who wants to purchase a used car from a dealer or seller. When a buyer
wants to purchase a used car, a buyer can search the car in a market place or on the web provided
by service broker. When a buyer requests dealers and brokers for purchasing the car, he or she
generally describe the specific constraints such as vehicle age, accumulated mileage, brand, model,
budget, and so on. Based on identified information about the condition of the car, he or she can
make a purchase decision under relatively low uncertainty and risk. The more provided information
is trustful and abundant, the more they can reduce risk and uncertainty.
– Owner (Seller): An owner (seller) is someone who wants to sell his or her car to others including a
dealer and individual buyer. When an owner tries to sell the car, he or she simply sell a dealer or an
individual the car at a negotiated price. Otherwise, he or she can ask a dealer transaction brokering.

– Service Broker: Service broker mediates an interaction among buyers, sellers, and dealers through
the information transferred by trust information provider. Based on the information, trust service
broker can inform the identified level of trust of owner, registered vehicle, and seller.
– Trust information provider: Trust information provider responses various requests from a service
broker and others. Trust information provider analyses the level of trust by tracing the accumulated
data from various sources including social network, insurance company, vehicle repair shop, public,
and the car itself.

III.5.3 Service flow

Figure III.12 – Used car transaction service flow

 Detailed flow description (Figure III.12)
1) A dealer registers the used car in trust service brokers as an owner makes a request to a dealer for
selling the used car.
2) Trust information provider complies with a service broker’s request of transferring trustworthy data
related to the car.
3) Trust information provider gathers the relevant data from not only the external data sources such
as insurance company, public organization, social network services, but also an internal data source
such as on-board diagnostic scanner, which transfers historical data from car to the platform. If car

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