Patent ID: 11882114
Assignee: KOGA ELECTRONICS CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 1:
2. The method according to claim 1, wherein the step (3) further comprising:
(3-1) generating a new confirmation code at originating-side communication device at each receipt of the authentication code from the receiving-side communication device through the IP network, and sending the new confirmation code to the receiving-side communication device through the IP network together with the received authentication code by means of packets of new communication which is not affected by past communication information;
(3-2) determining at the receiving-side communication device that the originating-side communication device is false and terminating the communication when the packets received from the originating-side communication device through the IP network do not contain the latest authentication code sent from the receiving-side communication device through the IP network, while overwriting the received confirmation code on a storage of the receiving-side communication device and sending the overwritten confirmation code and the received authentication code to the originating-side communication device through the IP network by means of packets of new communication which is not affected by past communication information when the received packets contain the latest authentication code; and
(3-3) determining at the originating-side communication device that the receiving-side communication device is false and terminating the communication when the packets received from the receiving-side communication device through the IP network do not contain the latest authentication code and the latest confirmation code, while determining that the receiving-side communication device is true when the received packets contain the latest authentication code and the latest confirmation code.