Honda Motor Co., Ltd.
Authentication system

Abstract:

An authentication system includes a vehicle onboard ECU, an update tool for vehicle control software, and an authentication server for the update tool. The update tool substitutes predetermined-constant and first-random-number into predetermined-function to generate first-value and send it to the authentication server. The authentication server signs the first-value using secret-key and send it to the update tool. The update tool transmits the first-value and signature to the ECU upon connection. The ECU verifies the signature using public-key and substitutes the predetermined-constant and second-random-number into the predetermined-function to generate second-value and send it to the update tool. The update tool substitutes the second-value and first-random-number into the predetermined-function to generate third-value. The ECU substitutes the first-value and second-random-number into the predetermined-function to generate fourth-value upon verification of the signature. The ECU allows vehicle control software update by the update tool when the third-value and fourth-value are identical.