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—We investigate a technique for counterfeit detection of high-frequency radio frequency identification (RFID) cards based on the electromagnetic characteristics of the cards rather than the digital information that they transmit. We describe a method of quantifying the electromagnetic signature of an RFID card and identify a small set of features that is(More)
—We show that careful measurements of the unloaded resonance frequency and quality factor of radio frequency identification proximity cards allow identification of different card models and, for the set of cards we studied, identification with minimal error of individual cards of the same model. Furthermore, we show that card identification performance is(More)
— The multiple access channel with private messages has a single accepted capacity characterization. By contrast, when the same channel is considered with message sources that may be commonly known to multiple transmitters, a plurality of distinct capacity descriptions arises. Two descriptions currently exist in the literature, with the capacity region(More)
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