System and method of non-contact IC card for defending relay attack
A non-contact card reader technology, applied in the field of information security, can solve the problems of potential safety hazards, intrusion into non-contact IC cards, and the use of non-contact IC cards, to achieve defense against relay attacks, low cost, Wide range of effects
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[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0032]An embodiment of the present invention provides a non-contact IC card defense relay attack system, including a non-contact IC card and a card reader, when the distance between the non-contact IC card and the card reader is 5mm to 10mm, the non-contact The non-contact IC card and the card reader establish a non-contact communication connection. The non-contact IC card detects that the magnetic field strength of the card reader is the first actual magnetic field strength H1, and H1 is within the range of 1.5A / m to 7.5A / m. The card reader sends H1 to the non-contact IC card, and starts timing, waiting for the response of the non-contact IC card; the non-contact IC card defines the received magnetic field strength as the first received magnetic field strength H1', and then calculates H1 and H1 'The difference between ΔH1, judge wh...
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