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US 12,108,248 B2Granted
Security system for a moveable barrier operator
AssigneeThe Chamberlain Group, Inc.
InventorJames J. Fitzgibbon
Life of this patent
Estimating the term…
Abstract
Electronic systems are provided for secure actuation of a remote device such as a moveable barrier operator. The systems address the “man in the middle” problem of persons intercepting and duplicating radio frequency signals from a control device by introducing timing parameters into a bidirectional communication sequence between at least two devices.
Claims20
A method of operation by a first device communicating with a second device to effect an action by the second device, the method comprising:
- receiving, by the first device, a request for the action to be performed,
- in response to receiving the request for the action to be performed, transmitting, from the first device to the second device, a first encrypted message that includes a first fixed code and a first changing code, the first changing code representing a modification to a changing code in a previous transmission from the first device to the second device;
- receiving, by the first device, a response from the second device validating the first encrypted message, wherein the response comprises a second encrypted message including a second fixed code and a second changing code that is independent from the first changing code;
- comparing, by the first device, the second fixed code and the second changing code to stored code values;
- based on the comparing, determining, by the first device, that the second fixed code and the second changing code are compliant with a set of rules;
- based on the determining, validating the response by the first device;
- and
- in response to validating the response, transmitting, by the first device, a third encrypted message including the first fixed code and a changed version of the second changing code to the second device, wherein the third encrypted message is configured to effect performance of the action by the second device.
5 more elements
An apparatus configured to communicate with a second device to effect an action by the second device, the apparatus comprising:
- a controller circuit;
- a transmitter in operative communication with the controller circuit;
- a receiver in operative communication with the controller circuit;
- a user input device in operative communication with the controller circuit;
- wherein the controller circuit is configured to:
- in response to receiving, from the user input device, a request for the action to be performed, control the transmitter to transmit a first encrypted message that includes a first fixed code and a first changing code, the first changing code representing a modification to a changing code in a previous transmission from the transmitter to the second device;
- through the receiver, receive, from the second device, a response validating the first encrypted message, wherein the response comprises a second encrypted message including a second fixed code and a second changing code that is independent from the first changing code;
- compare the second fixed code and the second changing code to stored code values;
- based on the comparing, determine that the second fixed code and the second changing code are compliant with a set of rules;
- based on the determining, validate the response;
- and
- in response to validating the response, control the transmitter to transmit a third encrypted message including the first fixed code and a changed version of the second changing code to the second device, wherein the third encrypted message is configured to effect performance of the action by the second device.
9 more elements
A non-transitory computer readable medium having stored thereon instructions that when executed by a controller circuit of a first device cause the controller circuit to perform operations comprising:
- receiving a request for an action to be performed,
- in response to receiving the request for the action to be performed, transmitting, to a second device, a first encrypted message that includes a first fixed code and a first changing code, the first changing code representing a modification to a changing code in a previous transmission to the second device;
- receiving a response from the second device validating the first encrypted message, wherein the response comprises a second encrypted message including a second fixed code and a second changing code that is independent from the first changing code;
- comparing the second fixed code and the second changing code to stored code values;
- based on the comparing, determining that the second fixed code and the second changing code are compliant with a set of rules;
- based on the determining, validating the response;
- and
- in response to validating the response, transmitting a third encrypted message including the first fixed code and a changed version of the second changing code to the second device, wherein the third encrypted message is configured to effect performance of the action by the second device.
5 more elements
Dependencies are inferred from the claim text.