Communications: electrical – Continuously variable indicating – With meter reading
Reexamination Certificate
2006-07-04
2006-07-04
Zimmerman, Brian (Department: 2635)
Communications: electrical
Continuously variable indicating
With meter reading
C375S316000
Reexamination Certificate
active
07071835
ABSTRACT:
In a system for communicating over electrical wiring in a house or other building, components are grouped and send messages to each other using a unique group identifier code associated with the group. 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.
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Keam Nigel S.
Odinak Gilad
Lee & Hayes PLLC
Microsoft Corporation
Zimmerman Brian
LandOfFree
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