| 摘要 |
<P>PROBLEM TO BE SOLVED: To more surely suppress spoofing by a third person that is not an authorized user in a communication system in road traffic. <P>SOLUTION: In a communication system related to communication between a roadside device and an on-vehicle device, and between the on-vehicle devices in road traffic, each of the roadside device 2 and the on-vehicle device 3 comprises: a storage part 24 or 33 storing a key table shared with its communication partner and storing an area section of the road traffic; and a control and communication part 27 or 37 perceiving an area in which it is located and a period to which the present time belongs, acquiring the key corresponding to the area and the period from the key table and transmitting/receiving data by using the acquired key within the perceived area and period. <P>COPYRIGHT: (C)2012,JPO&INPIT |
