Method for preventing interception in radio frequency recognition system using back-scattering modulation technique

A radio frequency identification system and backscatter modulation technology, which is applied in the field of anti-interception in the radio frequency identification system, can solve problems such as inability to solve third-party interception, and achieve the effect of improving anti-interception ability, enhancing security, and realizing confidentiality

Active Publication Date: 2009-02-04
TSINGHUA UNIV
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Problems solved by technology

[0005] To sum up, if the transmission process of the reader-writer and the tag is not encrypted, its signal is easy to be intercepted, and the current encryption technology for the radio frequency identification system is based on the method of mutual authentication between the reader-writer and the tag, which cannot Solve the problem of third-party interception during transmission

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  • Method for preventing interception in radio frequency recognition system using back-scattering modulation technique
  • Method for preventing interception in radio frequency recognition system using back-scattering modulation technique
  • Method for preventing interception in radio frequency recognition system using back-scattering modulation technique

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Embodiment Construction

[0021] The specific implementation will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0022] figure 1 Is the structure diagram of the radio frequency identification system. In the figure, the reader 101 includes a transmitting circuit and a receiving circuit. The transmitting circuit and the receiving circuit are isolated by the transceiver isolation module 102. The antenna 103 is used to send the transmitting signal 104 to the tag and receive the response signal 105 returned from the tag. The reader passes through RS232, RS485 and other interfaces are connected with the host control system.

[0023] figure 2 It is the working principle diagram of the RFID system reader. In the figure, the baseband circuit 201 controls the local oscillator module 202 through the local oscillator control signal 21...

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Abstract

The invention discloses an interception prevention method which adopts the backscatter modulation technology in the RF identification system and belongs to the RF identification technical field in the wireless communication; the technical proposal includes that when the reader-writer sends an instruction to the label, the fixed frequency of the carrier signal is changed to be changeable frequency, or the fixed phase of the carrier signal is changed to be changeable phase; when the reader-writer receives the label reply and sends a signal to the label, the fixed frequency of the carrier signal is changed to be changeable frequency, or the fixed phase of the carrier signal is changed to be changeable phase; meanwhile, the constant amplitude of the carrier signal is changed to be changeable amplitude. The communication mode of the reader-writer and the label is improved to prevent the third party receiver from demodulating the correct signal and realize the encryption in the transmission process of the RF identification system so that the interception prevention capability of the RF identification system is improved effectively and the safety of the RF identification system is enhanced.

Description

technical field [0001] The invention belongs to the technical field of radio frequency identification of wireless communication, in particular to a method for preventing interception in a radio frequency identification system using backscattering modulation technology. Background technique [0002] RFID (Radio Frequency Identification) technology in the field of communication is an automatic item identification technology that uses radio frequency for long-distance communication to identify items. Compared with traditional barcode technology, RFID technology has the characteristics of large data storage capacity, long reading distance, fast recognition speed, long service life, readable and writable, strong environmental adaptability, waterproof and antimagnetic, etc. These advantages make its application prospect very broad, and can be used in many fields such as industrial manufacturing, commercial supply chain management, public transportation management, commodity anti-c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00
Inventor 张春王敬超王志华
Owner TSINGHUA UNIV
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