Authentication of an electromagnetic terminal-transponder couple by the terminal
First Claim
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1. A method of authentication, comprising:
- transmitting, to a transponder located in a magnetic field of a terminal, first data relative to a first level of a current in an oscillating circuit of the terminal, the first level of the current measured by the terminal for a first value of a resistive load of the transponder;
receiving second data relative to a second level of the current in the oscillating circuit of the terminal, the second data evaluated by the transponder for a second value of the resistive load of the transponder;
obtaining third data relative to the second level of the current in the oscillating circuit of the terminal, the second level of the current measured by the terminal for the second value of the resistive load of the transponder; and
in response to receiving the second data and obtaining the third data, determining an authenticity of the transponder.
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Abstract
A method of authentication, by a terminal generating a magnetic field, of a transponder located in this field, wherein: first data, relative to the current in an oscillating circuit of the terminal, measured by the terminal for a first value of the resistive load of the transponder, are transmitted to the transponder; second corresponding data are evaluated by the transponder for a second value of the resistive load and are transmitted to the terminal; and said second data are compared with third corresponding data, measured by the terminal for the second value of the resistive load.
27 Citations
20 Claims
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1. A method of authentication, comprising:
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transmitting, to a transponder located in a magnetic field of a terminal, first data relative to a first level of a current in an oscillating circuit of the terminal, the first level of the current measured by the terminal for a first value of a resistive load of the transponder; receiving second data relative to a second level of the current in the oscillating circuit of the terminal, the second data evaluated by the transponder for a second value of the resistive load of the transponder; obtaining third data relative to the second level of the current in the oscillating circuit of the terminal, the second level of the current measured by the terminal for the second value of the resistive load of the transponder; and in response to receiving the second data and obtaining the third data, determining an authenticity of the transponder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A terminal comprising:
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an oscillating circuit configured to; generate a magnetic field, transmit data, via the magnetic field, to a transponder, and receive data, via the magnetic field, from the transponder, the transponder being located in the magnetic field; and a processor configured to; use the oscillating circuit to transmit first data to the transponder, the first data corresponding to a first level of the current in the oscillating circuit, the first level of the current corresponding to a first value of a resistive load of the transponder, use the oscillating circuit to receive second data, the second data corresponding to a second level of the current in the oscillating circuit, the second data being provided by the transponder, the second level of the current corresponding to a second value of the resistive load of the transponder, obtain third data corresponding to the second level of the current in the oscillating circuit, the third data depending on a measurement of the second level of the current in the oscillating circuit, and determine an authenticity of the transponder in response to receiving the second data and obtaining the third data.
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15. A terminal device comprising:
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an oscillating circuit configured to generate a magnetic field; a regulating circuit configured to regulate a phase of a current of the oscillating circuit; and a processor configured to determine an authenticity of a transponder in the magnetic field based, at least in part, on data received from the transponder, the received data corresponding to a level of the current in the oscillating circuit, the level of the current corresponding to a value of a resistive load of the transponder, wherein the data received from the transponder is second data, wherein the level of the current in the oscillating circuit is a second level corresponding to a second value of the resistive load of the transponder, and wherein the processor is configured to cause the terminal to transmit, to the transponder, first data corresponding to a first level of the current in the oscillating circuit of the terminal, the first level of the current measured by the terminal for a first value of the resistive load of the transponder. - View Dependent Claims (16, 17)
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18. A terminal device comprising:
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an oscillating circuit configured to generate a magnetic field; a regulating circuit configured to regulate a phase of a current of the oscillating circuit; and means for determining an authenticity of a transponder in the magnetic field based, at least in part, on data received from the transponder, the received data corresponding to a level of the current in the oscillating circuit, the level of the current corresponding to a value of a resistive load of the transponder, wherein the data received from the transponder is second data, wherein the level of the current in the oscillating circuit is a second level corresponding to a second value of the resistive load of the transponder, and wherein the processor is configured to cause the terminal to transmit, to the transponder, first data corresponding to a first level of the current in the oscillating circuit of the terminal, the first level of the current measured by the terminal for a first value of the resistive load of the transponder.
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19. A system comprising:
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a transponder; and a terminal, the terminal including; an oscillating circuit configured to generate a magnetic field; a regulating circuit configured to regulate a phase of a current of the oscillating circuit, and a processor configured to determine an authenticity of the transponder in the magnetic field based, at least in part, on data received from the transponder, the received data corresponding to a level of the current in the oscillating circuit, the level of the current corresponding to a value of a resistive load of the transponder, wherein the data received from the transponder is second data, wherein the level of the current in the oscillating circuit is a second level corresponding to a second value of the resistive load of the transponder, and wherein the processor is configured to cause the terminal to transmit, to the transponder, first data corresponding to a first level of the current in the oscillating circuit of the terminal, the first level of the current measured by the terminal for a first value of the resistive load of the transponder. - View Dependent Claims (20)
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Specification