The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 18, 2014
Filed:
Dec. 15, 2010
Olivier Savry, Sassenage, FR;
Pierre-henri Thevenon, Grenoble, FR;
Olivier Savry, Sassenage, FR;
Pierre-Henri Thevenon, Grenoble, FR;
Abstract
A method of protection of a near-field contactless communication system against malicious attacks. The method includes exchange of information between a reader and a contactless card of duration T, measured with respect to a starting instant tseen from the reader, decoding of this information by the card, sending by the card a return signal temporally set with respect to an instant t'+T, where t′is the starting instant as seen by the card taking into account delays in propagation or processing of signals received from the reader, detection of the return signal by the reader, determination of the temporal setting of the return signal with respect to the starting instant t, and interruption of communication by the reader if the temporal setting of the return signal detected is not equal to the instant t+T with a predetermined margin of error. The return signal is a pseudo-random sequence.