Patent ID: 11895251
Assignee: ASSA ABLOY AB
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of device authentication, the method comprising:
sending an authentication command from an authenticating initiator device to a receiver device to be authenticated;
transmitting a first random number from the receiver device to the authenticating initiator device in response to the authentication command, wherein the first random number is determined using a counter value and updating the counter value for each communication session between the authenticating initiator device and the receiver device;
determining, by the receiver device, first key information using a static encryption key specific to the receiver device and the first random number transmitted by the receiver device in response to the authentication command;
in response to receiving communication that includes the first random number, determining by the authenticating initiator device, the first key information using the first random number, a second random number and second key information specific to the authenticating initiator device;
transmitting the first random number, the second random number, and the second key information from the authenticating initiator device to the receiver device;
transmitting the first random number, the second random number, and the first key information from the receiver device to the authenticating initiator device according to a script included in the receiver device, wherein the first key information includes a third random number predictable by the authenticating initiator device; and
encrypting information communicated between the authenticating initiator device and the receiver device using an encryption key determined using the static encryption key, the first key information and the second key information.