Authorization system and method for vehicle remote diagnosis

The invention discloses an authorization system and method for vehicle remote diagnosis. The system comprises a diagnosis equipment module, a diagnosed vehicle module and a bill server module, wherein the diagnosis equipment module, the diagnosed vehicle module and the bill server module are correlated with one another and included in a state storage assembly, and through a state table in the storage assembly, remote authorized diagnosis for a diagnosed vehicle is displayed. The method includes the steps that an authorization bill is requested for, bill and diagnosis strategy generation is performed, the bill is issued and received, and authorization is completed. The bill server is introduced for performing validity verification on the identities of participants of a diagnosis conversation and performing authorization, and under a non-symmetric cipher mechanism, a system frame based on the bill server is used for achieving mutual authentication for the identities of the diagnosis bodies, freshness, privacy, completeness and non-repudiation of the authorized bill and a management mechanism for a diagnosis instruction, improving security of the vehicle remote diagnosis conversation and guaranteeing that the bill is effectively issued in time.