Patent ID: 11882119
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC G  H

Claim 7:
8. A cryptographic key distribution method performed by a communication system including a management communication apparatus, a first communication apparatus, and a second communication apparatus,
communicating, whereby the first communication apparatus is capable of using a plurality of IP addresses in different versions from each other,
sending by the first communication apparatus a discovery request, and receiving by the management communication apparatus the discovery request;
receiving by the first communication apparatus a discovery response from the management communication apparatus,
starting by the first communication apparatus and the management communication apparatus a first authentication process;
wherein the first authentication process includes a mutual authentication process between the first communication apparatus and the management apparatus;
the cryptographic key distribution method comprising: notifying the management communication apparatus of a first IP address among the plurality of IP addresses in the first authentication process for entering the communication system, and
notifying the management communication apparatus of a second IP address among the plurality of IP addresses after the first authentication process, the notifying being executed by the first communication apparatus;
obtaining a request for a cryptographic key for performing cryptographic communication between the first communication apparatus and the second communication apparatus, the obtaining being executed by the management communication apparatus; and
performing, in response to the request for the cryptographic key obtained, a first cryptographic key distribution process for distributing the cryptographic key to the first communication apparatus and a second cryptographic key distribution process for distributing the cryptographic key to the second communication apparatus, the performing being executed by the management communication apparatus.