| 摘要 |
<p>It is possible to strictly guarantee that a mobile body was at a certain location at a certain time. A location module M<SUB>i</SUB> sends an identifier (ID<SUB>i</SUB>) to a location server S<SUB>xyz</SUB> to request for location guarantee. The location server S<SUB>xyz</SUB> creates a signature for a message formed by the location information, the time information, the identifier of the location server S<SUB>xyz</SUB>, and the location module identifier by using a secret key of the location server S<SUB>xyz</SUB>. By adding the signature to the message to create a location certificate, which is sent to the location module M<SUB>i</SUB>. The location module M<SUB>i</SUB> sends the location certificate to a verifier V. The verifier V verifies the signature of the location certificate by using a public key of the location server S<SUB>xyz</SUB>. If the verification is successful, the location information and the time information are received.</p> |
