A defense system for car access control remote key radio frequency replay attack based on time stamp

Abstract

The invention discloses a timestamp based automobile entrance guard remote key radio-frequency replay attack defensive system. A timing device needs to be additionally mounted on an automobile RKE device and an automobile remote key; and after it is detected that an automobile owner completes automobile locking motion, the automobile remote key and the automobile RKE device issue a working command to the additionally-mounted timing device at the same time to start timing, and the timing device transmits time information of all moments to the automobile remote key and the automobile RKE device. When the automobile remote key detects that command buttons of automobile locking, automobile unlocking and the like are pressed down, internally-prestored serial numbers are combined with timing information transmitted from the timing device to carry out encryption to form a ciphertext, and the ciphertext is transmitted out through an RFID (radio frequency identification) module. After the ciphertext is received by the RFID (radio frequency identification) module of the automobile RKE device, a plaintext is obtained through decryption via a corresponding algorithm, accuracy of serial numbers in the plaintext and the timing information is judged, and then corresponding motion is executed.

Description

technical field [0001] The invention relates to the field of automobile information security, in particular to a time stamp-based radio frequency replay attack defense system for automobile access control remote keys. Background technique [0002] With the development of the automobile industry, the combination of automobiles and electronic systems is getting closer and closer. RKE remote control access control system is favored by people because of its convenience and quickness. However, since the unlocking key of the early RKE system is fixed, thieves can open the car lock by intercepting the unlocking signal and simply replaying it. [0003] In this regard, the car factory has developed a new set of RKE system based on rolling code authentication. The principle is that the encoder detects the key input, wakes up the system from the power saving state, adds 1 to the synchronous count, and encrypts it with the serial number with the key. Form ciphertext data and send it ou...

AI Technical Summary

Problems solved by technology

[0011] The present invention aims to overcome the low randomness of the existing rolling code protection technology, aiming at the characteristics of car access control replay attacks, and provides a simple structure, easy to implement, and difficult to predict radio frequency replay attack of car access control remote control keys based on time stamps defense system

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