US 11,838,416 B2
Communication system and control device
Yosuke Ohashi, Aichi (JP); and Masateru Furuta, Aichi (JP)
Assigned to KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO, Aichi (JP)
Appl. No. 17/600,750
Filed by KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO, Aichi (JP)
PCT Filed Apr. 3, 2020, PCT No. PCT/JP2020/015348
§ 371(c)(1), (2) Date Oct. 1, 2021,
PCT Pub. No. WO2020/209201, PCT Pub. Date Oct. 15, 2020.
Claims priority of application No. 2019-076300 (JP), filed on Apr. 12, 2019; and application No. 2020-052409 (JP), filed on Mar. 24, 2020.
Prior Publication US 2022/0191022 A1, Jun. 16, 2022
Int. Cl. H04L 9/16 (2006.01); B60R 25/24 (2013.01); H04L 9/32 (2006.01)
CPC H04L 9/16 (2013.01) [B60R 25/24 (2013.01); H04L 9/32 (2013.01); H04L 2209/805 (2013.01); H04L 2209/84 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A communication system, comprising:
a first device configured to transmit encrypted information that is encrypted by using a first encryption key;
a second device configured to execute a predetermined process based on the encrypted information obtained from the first device, and a second encryption key that is common to the first encryption key;
an authentication section; and
a key control section,
wherein the first device includes a first change section configured to change the first encryption key in a case where a first condition is satisfied, and
the second device includes a second change section configured to change the second encryption key in a case where a second condition is satisfied, the second condition being common to the first condition,
the first encryption key is generated on a basis of first key generation logic that is logic indicating a procedure of generating the first encryption key and first information,
the second encryption key is generated on a basis of the first information and second key generation logic that is common logic to the first key generation logic,
the first condition includes a condition that second information is input into the first change section,
the second condition includes a condition that the second information is input into the second change section,
in a case where the first condition is satisfied, the first change section changes the first encryption key into a third encryption key that is generated on a basis of the first key generation logic and the second information,
in a case where the second condition is satisfied, the second change section changes the second encryption key into a fourth encryption key that is generated on a basis of the second key generation logic and the second information,
a first one of the first device and the second device is a terminal,
a second one of the first device and the second device is a communication device that performs wireless communication with the terminal,
the authentication section generates authentication information used to authenticate the terminal, and
the key control section outputs a portion of authentication information to the first device as the second information, and outputs the portion of the authentication information to the second device as the second information.