| 摘要 |
PROBLEM TO BE SOLVED: To provide an immobilizer which is high in reliability of attestation, surely antitheft for a vehicle with its engine stopped, preventive from any misoperation, easy in fitting, and particularly effective for motorcycles, and an attestation method by the immobilizer. SOLUTION: The random number data is generated based on the engine starting time data stored in a storage means, the random number data is transmitted to a transponder 20 through a radio part, the key specific information is coded using a specified coding method based on the random number data to generate the attestation code, the transponder 20 receives a generated attestation key in which the key specific information is coded using the coding method based on the random number data, an engine start permission signal is transmitted to an engine control unit 2 when the attestation code matches with the attestation key, and the time until the engine is started after a power source for an immobilizer 10 is turned on is stored in the storage means.
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