Anti-replay method for radio frequency identification system based on time slot ALOHA protocol of frame

Abstract

The invention discloses an anti-replay method for a radio frequency identification system based on a frame time slot ALOHA protocol. The anti-replay method mainly comprises an electronic product code (EPC) sequence extraction part and an EPC sequence search part. According to the technical scheme, in a multi-tag radio frequency identification system, the EPC reading sequence of all tags in a round of tag identification is extracted, and the obtained EPC sequence is processed to obtain a Hash EPC and then stored in a Hash tree. Once the Hash EPC extracted in a new radio frequency identification session is found to exist in the Hash tree, the new radio frequency identification session will be considered as a replay attack and denied. Compared with an existing anti-replay method of a radio frequency system, the anti-replay method does not need to specially design a random noise sequence, the randomness of a frame-based time slot ALOHA protocol is directly used for defending the replay attack, any original signal is not changed, the situation that the received backscattering signal cannot be decoded due to distortion of the signal caused by external environment change is avoided, and the method can be deployed and applied to any multi-tag radio frequency identification system.

Description

technical field [0001] The invention belongs to the field of radio frequency identification, and in particular relates to a method for realizing replay attack detection by using the randomness inherent in the time slot ALOHA protocol of a frame to construct an EPC sequence. Background technique [0002] Radio frequency identification technology is an emerging wireless sensing technology in the past ten years. A typical passive RFID system includes a server, a reader connected to the server, and several RFID tags. The electronic product code EPC and some additional information representing the identity of the tag are stored in the radio frequency identification tag. In a session, the reader will broadcast instructions to the RFID tag, and the tag receiving the instruction will encode its own information into a backscatter signal and return it to the reader. The server obtains the EPC and additional information of the tag after the reader decodes the backscatter signal of th...

AI Technical Summary

Problems solved by technology

When the attacker replays the eavesdropped signal to the reader, because the reader has regenerated a random sequence Sb, it is impossible for the server to denoise the replayed signal according to the content of Sb, resulting in replay The signal cannot be decoded and is rejected

[0005] Although this anti-replay method based on random noise is effective, if the signal sent by the reader or the backscattered signal of the tag is distorted by the surrounding environme

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