Service system, server, and service tool

A server comprising:

• a generator configured or programmed to generate an access token through encryption calculation using identification information of at least one to-be-serviced unit and identification information of a service tool, the at least one to-be-serviced unit being a selected at least one of a plurality of electronic control units provided in or on a vehicle, the service tool being configured or programmed to at least one of diagnostically check or reprogram the at least one to-be-serviced unit, the access token being an access token that the service tool outputs to the at least one to-be-serviced unit to obtain authentication.

A service tool to at least one of diagnostically check or reprogram at least one to-be-serviced unit which is a selected at least one of a plurality of electronic control units provided in or on a vehicle, wherein the service tool is configured or programmed to:

• acquire an access token from a generator configured or programmed to generate the access token through encryption calculation using identification information of the at least one to-be-serviced unit and identification information of the service tool;
• and
• output the acquired access token to the at least one to-be-serviced unit to obtain authentication.