COMMUNICATION SYSTEM, VEHICLE-MOUNTED TERMINAL, ROADSIDE DEVICE

• US 20150358170A1
• Filed: 08/18/2015
• Published: 12/10/2015
• Est. Priority Date: 05/24/2010
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Electronics Corporation
• Inventors: ANDO, Eriko, NAGANUMA, Ken, OWADA, Toru
• Granted Patent: US 9,601,016 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G08G 1/096783 where the origin of the information is a roadside individual element
• CPC Class Codes: G08G 1/123 indicating the position of vehicles, e.g. scheduled vehicles; Managing passenger vehicles circulating according to a fixed timetable, e.g. buses, trains, tramstransmission of navigation instructions to vehicles G08G1/0968
• CPC Class Codes: H04L 2209/84 Vehicles
• CPC Class Codes: H04L 63/0823 using certificates cryptographic mechanisms or cryptographic arrangements for entity authentication involving certificates H04L9/3263
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
• CPC Class Codes: H04L 9/3268 using certificate validation, registration, distribution or revocation, e.g. certificate revocation list [CRL]
• CPC Class Codes: H04W 4/44 for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]

Abstract

A communication system (10) includes a certificate authority (100) for performing authentication, a roadside device (110), a vehicle-mounted terminal (120), a first server (130), and a second server (140). The vehicle-mounted terminal transmits its position information to the first server. The certificate authority acquires information about a vehicle-mounted terminal likely to appear according to place and time from the first server. The certificate authority allows the second server to verify validity of a certificate for a vehicle-mounted terminal acquired from the first server. The certificate authority generates a first list of vehicle-mounted terminals having valid certificates and a second list of vehicle-mounted terminals having invalid certificates according to place and time based on a verification result. The certificate authority transmits the first and second lists to the roadside device and the vehicle-mounted terminal. The roadside device and the vehicle-mounted terminal verify a certificate using the first and second lists.

Claims

1. A method for verifying a certificate in a communication system that includes a certificate authority configured to perform authentication;

a roadside device configured to be provided at a roadside;

a plurality of vehicle-mounted terminals each having a certificate;

a first server configured to collect position information about the vehicle-mounted terminals; and

a second server configured to manage information about the roadside device and vehicle-mounted terminals whose certificate is invalidated, the method comprising;

transmitting and receiving information between the roadside device and the vehicle-mounted terminals and between the vehicle-mounted terminals;

transmitting position information from the vehicle mounted terminals to the first server;

acquiring, using the certificate authority, appearance information about vehicle-mounted terminals whose likelihood of appearing is greater than a predetermined threshold, the appearance information being acquired according to place and time from the first server;

allowing, using the certificate authority, the second server to verify the validity of a certificate of a vehicle-mounted terminal that is acquired from the first server;

generating, using the certificate authority, a first list of vehicle-mounted terminals having valid certificates and a second list of vehicle-mounted terminals having invalid certificates according to place and time based on a verification result;

transmitting, using the certificate authority, the first list and the second list to the roadside device and the vehicle-mounted terminals; and

verifying a certificate with at least one from among the roadside device and the vehicle-mounted terminals using the received first and second lists.

2. The method for verifying a certificate according to claim 1, further comprising:

omitting certificate verification and discarding a message, in response to receiving the message from a message sender on the second list; and

omitting certificate verification and verifying a signature, in response to receiving a message from a message sender on the first list.

3. The method for verifying a certificate according to claim 2, further comprising:

transmitting, using the roadside device, information needed for authentication and key sharing to a certain vehicle-mounted terminal and another roadside device, in response to the certain vehicle-mounted terminal acquiring a common key needed to verify a validity of the first list and the second list from the roadside device.

4. The method for verifying a certificate according to claim 3, further comprising:

confirming, using the roadside device and the certain terminal, an effective place and an effective time in the first list and the second list; and

deleting the first list and the second list, in response to the roadside device and the vehicle-mounted terminal satisfying one of conditions of existing outside the effective place and exceeding the effective time.

5. The method for verifying a certificate according to claim 4, further comprising:

detecting, using the roadside device or the certain vehicle-mounted terminal, an invalidated certificate during one of vehicle-to-vehicle communication and road-to-vehicle communication, and notifying this information to the certificate authority; and

generating and transmitting, using the certificate authority, the second list to the roadside device and at least one of the vehicle-mounted terminals.

6. A method of communicating using a vehicle-mounted terminal configured to transmit and receive information from one of a roadside device and another vehicle-mounted terminal, the method comprising:

storing on the vehicle-mounded terminal a first list of vehicle-mounted terminals having valid certificates according to place and time and a second list of vehicle-mounted terminals having invalidated certificates;

omitting certificate verification and discarding a received message in response to receiving the message from a sender on the second list;

omitting certificate verification and verifying a signature in response to receiving a message from a sender on the first list;

confirming an effective place and an effective time in the first list and the second list; and

deleting the first list and the second list, in response to the vehicle-mounted terminal existing outside the effective place and/or exceeding the effective time.

7. A method of communicating using a roadside device configured to transmit and receive information from a vehicle-mounted terminal, the method comprising:

storing on the roadside device a first list of vehicle-mounted terminals having valid certificates according to place and time and a second list of vehicle-mounted terminals having invalidated certificates;

omitting certificate verification and discarding a message received from a certain vehicle-mounted terminal in response to the second list listing the certain vehicle-mounted terminal;

omitting certificate verification and verifying a signature in response to receiving a message from a sender on the first list;

confirming an effective time in the first list and the second list; and

deleting the first list and the second list in response to the roadside device exceeding the effective time.

8. The method of communicating using a roadside device according to claim 7, further comprising:

transmitting, to a vehicle-mounted terminal and another roadside device, information needed for authentication and key sharing in response to the vehicle-mounted terminal acquiring a common key needed to verify a validity of the first list and the second list from the roadside device.