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A Method of Extracting Device Physical Fingerprint Features in Low SNR Conditions

A technology of extraction equipment and low signal-to-noise ratio, applied in the field of information security, can solve problems such as not fully meeting the needs of practical applications, and achieve the effect of solving the problem of low signal-to-noise ratio

Active Publication Date: 2019-07-23
NANJING INST OF CYBER TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the existing methods for extracting physical features of equipment cannot fully meet the needs of practical applications.

Method used

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  • A Method of Extracting Device Physical Fingerprint Features in Low SNR Conditions
  • A Method of Extracting Device Physical Fingerprint Features in Low SNR Conditions
  • A Method of Extracting Device Physical Fingerprint Features in Low SNR Conditions

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0032] This embodiment provides a method for extracting the physical fingerprint feature of the device under the condition of low signal-to-noise ratio. Through this method, after the receiver receives the signal with low signal-to-noise ratio, it can perform noise reduction processing without destroying the device fingerprint. , and extract the physical fingerprint features of the device from the noise-reduced signal for identity authentication.

[0033] The procedure of this method is as follows figure 1 Shown:

[0034] Step 1: First, the transmitter transmits a radio frequency signal. The radio frequency signal needs to include a repeated sequence, or there are constant parts in the repeated multi-frame signal, such as the spread spectrum sequence in the direct sequence spread spectrum system, ZigBee and WiFi system. The preamble signal and...

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Abstract

The invention discloses a method for extracting equipment physical fingerprint feature under a low signal-to-noise ratio condition. A receiver performs noise-reduction processing under the condition of not damaging the equipment physical fingerprint after receiving a low signal-to-noise signal, and then extracts the physical fingerprint feature of the equipment from the noise-reduced signal; and asignal referred in the method needs to include the repeated sequence or the repeatedly sent multi-frame signal contains invariable part; the method comprises the following steps: estimating the frequency and phase of the signal after receiving the low signal-to-noise ratio signal, and estimating modulated information data on the signal repeated sequence, acquiring multiple repeated sequence withsame polarities, and aligning and superposing the repeated sequence to improve the signal-to-noise ratio; and finally extracting the physical fingerprint of the equipment through the physical layer fingerprint extraction method, wherein the physical fingerprint of the equipment is used for the equipment identity identification. Through the method disclosed by the invention, the physical layer fingerprint feature of the equipment can be effectively extracted under the low signal-to-noise ratio, the problem that the equipment identification method based on the equipment physical fingerprint mustface the low signal-to-noise ratio in the practical application is effectively solved.

Description

technical field [0001] The present application relates to the field of information security, and in particular to a method for extracting physical fingerprint features of a device under a low signal-to-noise ratio. Background technique [0002] When the electromagnetic radiation source emits a signal, it will inevitably introduce the physical characteristics of the device. This feature is mainly caused by the power difference of the hardware components inside the device. Because each electronic component has a unique power differential, the physical characteristics of each device are also unique. This physical feature is like the "fingerprint" of the device, which is unique and difficult to clone, so this feature is also called physical fingerprint feature or radio frequency fingerprint feature. With the in-depth research on device physical fingerprint related technologies, physical fingerprint features are generally considered to be the unique features of wireless devices...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7087H04B1/7077H04B1/7073H04B1/707H04B1/10H04B1/7097
CPCH04B1/10H04B1/1027H04B1/707H04B1/70735H04B1/7077H04B1/7087H04B1/7097
Inventor 胡爱群邢月秀彭林宁
Owner NANJING INST OF CYBER TECH CO LTD
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