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Method and device for separating channel features and device physical fingerprints based on cepstrum

A technology of physical fingerprints and channel characteristics, applied in the field of information security, can solve the problems of difficult separation of signal distortion, influence of physical fingerprint characteristics of equipment, etc., to achieve the effect of improving channel robustness

Active Publication Date: 2022-01-07
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the signal distortion caused by the wireless channel and the signal distortion caused by the physical fingerprint of the device are difficult to separate
Furthermore, since the signal change caused by the wireless channel is greater than the physical fingerprint of the device, when the transmitter passes through different wireless channels, the channel influence will have a great impact on the extraction of the physical fingerprint feature of the device

Method used

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  • Method and device for separating channel features and device physical fingerprints based on cepstrum
  • Method and device for separating channel features and device physical fingerprints based on cepstrum
  • Method and device for separating channel features and device physical fingerprints based on cepstrum

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Embodiment Construction

[0045] This embodiment provides a cepstrum-based method for separating channel features and device physical fingerprints. This method is performed by the receiver. Therefore, before introducing this method, the processing performed by the transmitter is first introduced.

[0046] From the perspective of digital signals, the preamble signal s of the transmitter is a signal composed of 8 spreading codes of zero symbols:

[0047] s=[s 1, ,s 2 ,...,s 8 ]

[0048] Wherein, the transmitter may be ZigBee or other devices, as long as there is a repeated sequence in the transmitted preamble signal. The spreading code of the preamble signal s is the same, that is, s 1 =s 2 =...=s 8 , the preamble signal s passes through various components of the transmitter, specifically crystal oscillators, mixers, amplifiers, filters, power amplifiers, antennas, etc., and the preamble signal transmitted from the transmitter antenna contains the physical feature fingerprint information of the dev...

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Abstract

The invention discloses a cepstrum-based separation method and device for channel characteristics and equipment physical fingerprints. The method includes: (1) receiving a signal sent by a target transmitter, and down-converting the received signal to obtain a baseband signal; (2) Preprocessing the baseband signal to extract a leading signal, wherein the leading signal includes 8 leading symbols; (3) performing FFT transformation on each leading symbol to obtain a frequency domain signal of each leading symbol; (4) converting The frequency domain signal of each preamble symbol is transformed by log operation, and the cepstrum domain signal of each preamble symbol is obtained; (5) the cepstrum domain signal of the 2-8 preamble symbol is respectively subtracted the cepstrum domain signal of the first preamble symbol Spectral domain signal, get 7 leading signal differences of cepstrum domain, complete the separation of channel characteristics and device physical fingerprint; (6) use the 7 leading signal differences of cepstrum domain as device physical fingerprint for device identity authentication. The present invention can eliminate the influence of channel characteristics and improve the robustness.

Description

technical field [0001] The invention relates to the field of information security, in particular to a cepstrum-based separation method and device for channel characteristics and device physical fingerprints. Background technique [0002] The physical fingerprint feature of the device refers to the slight distortion of the transmitted signal caused by the power difference of the internal hardware components of the device. It is as unique and unclonable as a human fingerprint. Therefore, this feature is also called a physical fingerprint feature or a radio frequency fingerprint feature, so it can be used for identification and authentication of electromagnetic radiation sources. Specifically, the device identification technology based on physical fingerprint features can accurately distinguish wireless devices that use the same frequency, bandwidth, and modulation method, and has very good practical value. Therefore, the authentication system based on the physical fingerprin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/69H04W12/06H04W12/79
CPCH04B1/69H04W12/06H04W12/79
Inventor 胡爱群邢月秀李古月
Owner SOUTHEAST UNIV