Patent ID: 9525674
Filing Date: 2016-12-20
CPC Classification: G09C,H04L,H04W

Claim Text:
1. A method comprising the steps of: encrypting a message in a transmission node of a communication network, using an active key, the message comprising a header, a user data part, and an encryption data part, the encryption data part comprising data of a new key, sending the message from the transmission node to a reception node of the communication network, decrypting the message at the transmission node, using the active key, after the sending of the message from the transmission node and after reception of the new key at the reception node, replacing at both the transmission node and at the reception node the active key with the new key for further communication, exchanging a fallback key between the transmission node and the reception node, and regularly using the fallback key as a fallback in the event that the connection is lost, wherein the sending of the message between the transmission node and the reception node takes place by way of near field communication, wherein for the sending of the message, the transmission node codes the active key as a barcode and represents the barcode by way of an output device, and the reception node scans the barcode by way of an input device, and wherein the active key, the new key, and the fallback key are different keys.