Title：Method for preventing interception in radio frequency recognition system using back-scattering modulation technique
Country：China
Patent No.：200810222929.3
Legal Status：Authorized
Inventor：Chun Zhang, Jingchao Wang, Zhihua Wang
Assignee：Tsinghua University
Address：Mailbox No. 82, Beijing 100084
Filing Date：2008-09-23
Issue Date：2011-11-09
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.
Patent Certificate：
PDF/Jpg