System and method of non-contact IC card for defending relay attack

Abstract

The invention discloses a system and method of a non-contact IC card for defending a relay attack, and relates to the field of information security. The system comprises the non-contact IC card and a card reader. The card reader sends three-time magnetic field intensity information to the non-contact IC card and records sending time, the non-contact IC card detects actual magnetic field intensity of the card reader for three times, and the actual magnetic field intensity is compared with the received corresponding magnetic field intensity to judge whether the non-contact IC card is under attack or not; meanwhile, the card reader calculates the received time difference of the non-contact IC card returning to a normal instruction, the time difference is compared with a corresponding magnetic field intensity change time difference to judge whether the non-contact IC card is under the attack or not, and when the non-contact IC card is under the attack, the non-contact IC card sends out an abnormal instruction, and the card reader stops communicating and sends out an alerting signal. According to the system and method, the non-contact IC card can be effectively prevented from being subjected to the relay attack, safety of the non-contact IC card is guaranteed, and the system is wide in application range, low in cost and convenient to use.

Description

technical field [0001] The invention relates to the field of information security, in particular to a system and method for non-contact IC card defense against relay attacks. Background technique [0002] Contactless IC (Integrated Circuit Card, integrated circuit card) card, also known as radio frequency card, is composed of IC chip and induction antenna, and is packaged in a standard PVC (Poly Vinyl Chloride, polyvinyl chloride) card. The non-contact IC card can complete the read and write operations with the card reader through radio waves. As shown in 1, the card reader continuously emits a set of fixed-frequency electromagnetic waves to the surroundings. When the non-contact IC card is close to the reader, under the excitation of the electromagnetic wave, the non-contact IC card is activated to send and receive information and read and write operate. Since the non-contact IC card sends and receives information and reads and writes through radio waves, the non-contact ...

AI Technical Summary

Problems solved by technology

[0004] The existing contactless IC card has the following defects in use: the existing contactless IC card usually adopts the ISO14443 standard, the ISO14443 standard is an open communication protocol, and the ISO14443 standard can be adopted by relay attack equipment, so the Since the attacking device can invade the contactless IC card, there is a security risk in the use of the contactless IC card

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