AUTHENTICATION OF AN ELECTROMAGNETIC TERMINAL-TRANSPONDER COUPLE BY THE TERMINAL
First Claim
1. 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.
1 Assignment
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Accused Products
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.
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Citations
10 Claims
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1. A method of authentication, by a terminal generating a magnetic field, of a transponder located in this field, wherein:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification