| 摘要 |
PROBLEM TO BE SOLVED: To surely operate mutual certification of an IC card within a prescribed time in an inexpensive system, and to maintain security. SOLUTION: When an IC card 10 is inserted, an on-vehicle equipment main body 11 transmits a random number 1 (Ra) and a key code (Key A) to the IC card 10 so that a certification operation can be executed. In the on-vehicle equipment main body 11, the random number 1 (Ra), key code (Key A), the arithmetic result 2(result 2) of the IC card 10, random number 2 (Rb), and key code (Key B) are stored in a storage part 31, and a stop command is transmitted to the IC card 10. When the on-vehicles device enters a communication area in this state, the on-vehicle equipment main body 11 transmits the storage information in the storing part 31 to a road side controller 4 so that the certification operation can be executed, and transmits a resume commands and an arithmetic result 4 (Result 4) of the road side controller 4 to the IC card 10. The IC card 10 confirms the validity of the road side controller 4 according to the already obtained arithmetic result 3 (Result 3) and the arithmetic result 4 (Result 4). |
