Secure Contactless Communication Device and Method
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Accused Products
Abstract
A method for secured communication between a transmitter (10) and a receiver (1) in which a range of power levels transmitted by the transmitter (10) a range of frequencies inside which the transmission will occur, (10) are known or detectable by the receiver (1), the method including
- transmission by the receiver (1) of a power supply signal for the transmitter characterized in that the receiver (I) transmits for at least the whole duration of the transmission, a noise signal which buries the transmission signal,
- the receiver (1) subtracts from the received signal, the noise signal in order to obtain a useful signal. The invention also includes a receiving device operating according to the method.
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Citations
14 Claims
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1-7. -7. (canceled)
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8. :
- A method for secured communication between a transmitter and a receiver, wherein a range of power levels transmitted by the transmitter a band of frequencies inside which the transmission occurs, are known or detectable by the receiver, the method comprising;
transmitting by the receiver a signal for powering the transmitter;
transmitting by the transmitter a useful data signal by modulating a parameter of a carrier frequency of the useful data signal;
wherein the receiver transmits for at least the whole duration of the transmission of the useful data signal from the transmitter a noise signal independent of the transmitted data, having a spectral band that covers the frequency band inside which transmission occurs, and having a power level such that the ratio between the data signal level transmitted by the transmitter and the power level transmitted by the receiver is larger than a predetermined value, and the receiver subtracts the noise signal from the received signal to obtain the transmitted useful data signal. - View Dependent Claims (9, 10, 11, 12, 13)
- A method for secured communication between a transmitter and a receiver, wherein a range of power levels transmitted by the transmitter a band of frequencies inside which the transmission occurs, are known or detectable by the receiver, the method comprising;
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14. A reader of a chip card comprising:
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means for generating a power supply signal for powering a transmitter of the card;
a space for receiving a card providing coupling between circuits borne by the card; and
transmission reception means of the reader coupled with the means for generating the power supply signal, wherein the receiver includes means for modulating the power supply signal, a random signal generator coupled with said means for modulating the power supply signal, means for processing the signal received by the receiver, being coupled with the random signal generator, with the transmission/reception means and with the modulation means, the means for processing the received signal by the receiver separating the signal present on the transmission reception means and the modulation signal, to recover a useful signal transmitted by the transmitter of the card.
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Specification