Message formatting, authentication, and error detection in home control systems
June 12, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesAppliance control system Appliance system Security control system Remote control system using power line of remote site Power line carrier controlled lighting system Appliance control system with programmable receivers Method and apparatus for resource allocation in a communication network system Programmable distributed appliance control system Trainable transceiver capable of learning variable codes Patent #: 5661804 InventorsAssigneeApplicationNo. 08/874046 filed on 06/12/1997US Classes:340/825.52, Addressing375/316RECEIVERSExaminersPrimary: Zimmerman, BrianAttorney, Agent or FirmInternational ClassH04Q 1/00 (20060101)AbstractA system for communicating over electrical wiring in a house or other building is presented. Components are grouped and each group is assigned a group identifier code. Components communicates only with components of the same group, using the group identifier code. Each message includes the group identifier code, message data, and a message authentication code (MAC) that is calculated for each message. A receiving component disregards any message whose group identifier code is not the same as that of the receiving component. MACs are calculated using a shared key value and a one-way hash function. The shared key value, in turn, is taken from an ordered sequence of key values that is defined for each component group based on a counter value. To change to a new key value, one component of the group simply starts using the new key value. When a receiving component receives a message that does not. | |
