Safety access service strategy based on UDS diagnosis and vehicle

Abstract

The invention discloses a security access service strategy based on UDS diagnosis and a vehicle, and the strategy is characterized in that the strategy comprises the following steps: S1, after a vehicle-mounted computer of the vehicle accesses a diagnosis device, the diagnosis device sends a request seed instruction to the vehicle-mounted computer; s2, the vehicle-mounted computer judges whether the request seed instruction is wrong or not; s3, if the judgment result of the step S2 is no, the diagnosis device sends a decryption key to the vehicle-mounted computer, and the vehicle-mounted computer compares whether the decryption key is the same as an actual key recorded by the vehicle-mounted computer or not; s4, if the judgment result of the step S3 is yes, the vehicle-mounted computer sends a positive response; and S4 ', if the judgment result of the step S3 is whether, accumulating the error times of the decryption key, and when the error times are greater than or equal to 3, replying an unlocking failure instruction by the vehicle-mounted computer. According to the safe access service strategy for UDS diagnosis, the number of allowed access times of negative response in an ISO (International Standard Organization)-14229 protocol is restrained, and the safety of 27 service is improved, so that the use safety of a vehicle can be improved.

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