Authenticating a signal based on an unknown component thereof

Pulse or digital communications – Spread spectrum – Direct sequence

Reexamination Certificate

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C375S130000

Reexamination Certificate

active

08068534

ABSTRACT:
Authentication of a signal, signalA, that is provided as having been received from a source at a first global location by comparing it to a signal that is received from the source at a second global location, signalB, where signalBcontains an unknown signal that is unique to the source, and determining that signalAcontains the same unknown signal that is contained in signalB.

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patent: 2002/0017977 (2002-02-01), Wall
patent: 2004/0203868 (2004-10-01), Eidson
patent: 2007/0200756 (2007-08-01), Saito

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