In an authentication system, when an electrical component with a temporary ID recorded by a temporary ID assignment device is connected to a switching hub, a temporary authentication device performs temporary authentication based on switching hub information describing the switching hub to which the electrical component is connected, the temporary ID of the electrical component, and temporary authentication inquiry information. A main authentication device performs main authentication based on the switching hub information of the switching hub to which the electrical component with a formal ID recorded by the formal ID assignment device is connected, and the formal ID of the electrical component, and main authentication inquiry information.
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