Secure device rejoining for mesh network devices
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H05B-037/02
H05B-039/04
H05B-041/36
H04W-024/08
H04W-084/18
H04L-029/08
H04W-088/16
출원번호
US-0620448
(2017-06-12)
등록번호
US-9974150
(2018-05-15)
발명자
/ 주소
Oliver, Jason Lawrence
출원인 / 주소
RAB Lighting Inc.
대리인 / 주소
SmithAmundsen LLC
인용정보
피인용 횟수 :
0인용 특허 :
177
초록▼
Securing device rejoining for a mesh network of a wireless lighting control system is disclosed. A potential security weakness of a mesh network protocol is that a proprietary link key may be discovered by close, expert examination of a device, potentially facilitating the joining of a “rogue” devic
Securing device rejoining for a mesh network of a wireless lighting control system is disclosed. A potential security weakness of a mesh network protocol is that a proprietary link key may be discovered by close, expert examination of a device, potentially facilitating the joining of a “rogue” device to the network. Requiring subsequent rejoins of any device that had previously joined the network to use a current randomly generated link key, rather than the proprietary link key, prevents rogue devices only having the proprietary link key from joining.
대표청구항▼
1. A lighting control system having a wireless mesh network, the system comprising: at least one proprietary link key;a gateway including a communications module acting as a coordinator of the network, the coordinator storing and providing a current network key, the at least one proprietary link key
1. A lighting control system having a wireless mesh network, the system comprising: at least one proprietary link key;a gateway including a communications module acting as a coordinator of the network, the coordinator storing and providing a current network key, the at least one proprietary link key, and an updated link key; and,a plurality of devices each including a device radio module and data storage storing the at least one proprietary link key; and,wherein the communications module initially joins to the mesh network one of the plurality of devices by:receiving a join request from a device radio module;sending to the device radio module a current network key encrypted by the proprietary link key; andgenerating, storing, and sending to the device radio module an updated link key encrypted by the current network key, the joining one of a plurality of devices storing the updated link key; and,wherein the communications module rejoins to the mesh network one of the plurality of devices by:receiving a join request from a device radio module; andsending to the device radio module the current network key encrypted by the updated link key. 2. The lighting control system of claim 1, wherein the gateway periodically rotates the current network key. 3. The lighting control system of claim 1, wherein the gateway periodically rotates the updated link key. 4. The lighting control system of claim 1, wherein the communications module only sends a current network key encrypted by the proprietary link key for a scheduled time period during which at least one of the plurality of devices are expected to initially join the mesh network without an updated link key, thereby preventing a rogue device with the proprietary link key from joining the mesh network during times outside of the scheduled time period. 5. The lighting control system of claim 1, wherein the communications module includes a radio transceiver and a processor. 6. The lighting control system of claim 5, wherein at least one of the devices is a controller having an output module selectively powering a lighting fixture. 7. The lighting control system of claim 5, wherein at least one of the devices is an occupancy sensor. 8. The lighting control system of claim 5, wherein at least one of the devices is a daylight harvester. 9. The lighting control system of claim 5, wherein at least one of the devices is a controller having an input module detecting the state of a third party device. 10. The lighting control system of claim 5, wherein at least one of the devices includes a user site device. 11. A system having a wireless mesh network, the system comprising: a coordinator including a communications module, the coordinator storing and providing a current network key, at least one proprietary link key, and an updated link key; and,a plurality of devices each including a device radio module and data storage storing the at least one proprietary link key; and,wherein the communications module initially joins to the mesh network one of the plurality of devices by:receiving a join request from a device radio module;sending to the device radio module a current network key encrypted by the proprietary link key; andgenerating, storing, and sending to the device radio module an updated link key encrypted by the current network key, the joining one of a plurality of devices storing the updated link key. 12. The system of claim 11, wherein the communications module rejoins to the mesh network one of the plurality of devices by: receiving a join request from a device radio module; andsending to the device radio module the current network key encrypted by the updated link key. 13. The system of claim 12, wherein the coordinator periodically rotates the current network key. 14. The system of claim 12, wherein the coordinator periodically rotates the updated link key. 15. The system of claim 12, wherein the communications module only sends a current network key encrypted by the proprietary link key for a scheduled time period during which at least one of the plurality of devices are expected to initially join the mesh network without an updated link key, thereby preventing a rogue device with the proprietary link key from joining the mesh network during times outside of the scheduled time period. 16. The system of claim 12, wherein the communications module includes a radio transceiver and a processor. 17. The system of claim 12, wherein: the system is a lighting control system; andat least one of the devices is a controller having an output module selectively powering a lighting fixture. 18. A method of securely joining and rejoining a device to a wireless mesh network, comprising: receiving at a coordinator a join request from a plurality of devices each having a proprietary link key;sending from the coordinator to the plurality of devices a first network key encrypted by a proprietary link key;generating and sending to the plurality of devices an updated link key encrypted by the first network key;receiving and storing the updated link key at each of the plurality devices;rotating from the first network key to a second network key;sending the current network key to at least one presently joined device of the plurality of devices;receiving at the coordinator a join request sent from a sleepy device of the plurality of devices, the sleepy device having the first network key and not having the second network key; andsending from the coordinator to the sleepy device the second network key encrypted by the updated link key. 19. The method of claim 18, further comprising the step of scheduling a time period during which at least one of the plurality of devices are expected to initially join the wireless mesh network without an updated link key; and wherein the step of sending from the coordinator to the plurality of devices a first network key encrypted by a proprietary link key is only completed by the coordinator during the scheduled time period, thereby preventing a rogue device with the proprietary link key from joining the mesh network during times outside of the scheduled time period.
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