Relay attack defense method and system based on pulse time-of-flight ranging

Abstract

The invention discloses a relay attack defense method and system based on pulse time-of-flight ranging, wherein the method includes the following steps: synchronizing the verification node and the verification node in advance; the verification node transmits the challenge bit C i The pulse modulated by the pulse position; the proof node receives the first pulse, detects the rising edge of the first pulse envelope, and demodulates to obtain the data C i ; The proof node is based on the challenge bit C i Calculate the response bit R i ;Prove that the node obtains the transmit pulse trigger signal based on the delay of the rising edge of the first pulse envelope, and transmits the response bit R i The pulse modulated by the pulse position; the verification node receives the second pulse, detects the rising edge of the second pulse envelope, and demodulates to obtain the data R i , and measure the signal flight time; the verification node verifies the position of the proof node and responds with bit R i correctness. This method can reduce the signal sending and receiving delay of the proof node, and at the same time achieve high ranging accuracy, effectively reducing the possibility of relay attacks.

Description

technical field [0001] The invention relates to the technical field of pulse demodulation and secure communication, in particular to a relay attack defense method and system based on pulse time-of-flight ranging. Background technique [0002] With the rapid development of wireless technology, wireless security authentication has been widely used in daily life, including car intelligent keyless entry system, intelligent access control system, contactless bank card payment system and ad hoc network interconnection, etc. The terminal (verification node) communicates wirelessly with the user (certification node) and verifies its identity. After the verification is successful, the user can obtain the use or access permission of the terminal. [0003] A major security problem in wireless security authentication is called relay attack (Relay Attack). A relay attack refers to one or more attackers forwarding information between a validator node and a proof node that are far apart, ...

AI Technical Summary

Problems solved by technology

However, traditional wireless communication technologies such as Wifi, Bluetooth, and Zigbee (Zigbee protocol) are generally based on signal strength ranging, and the ranging accuracy is poor, and they are vulnerable to interference and attacks. Wireless transmission scheme for physical layer defense against relay attacks

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