The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 07, 2015
Filed:
Jun. 30, 2011
Yuexing Peng, Beijing, CN;
Kan Zheng, Beijing, CN;
Guangwei LI, Beijing, CN;
Beijing University of Posts and Telecommunications, Beijing, CN;
Abstract
The present invention discloses a method for generating a consistent cryptographic key based on wireless channel features. First of all, channel estimated values ĥ, ĥand channel estimate mean square error MSE are obtained through channel estimate, and then quantized channel eigenvectors {tilde over (h)}and {tilde over (h)}are obtained through quantization coding; next, inconsistency between {tilde over (h)}and {tilde over (h)}is equivalent to obtaining {tilde over (h)}at end B through virtual channel noise adding the channel eigenvector {tilde over (h)}sent by end A, and Signal-to-Noise ratio SNR Γ of the virtual channel is determined; a proper coding mode ENC is determined according to the virtual channel SNR Γ; both communication parties perform corresponding coding and decoding according to ENC and thereby obtain an estimated value {tilde over (ĥ)}of {tilde over (h)}; finally, a cryptographic key generating function is applied to {tilde over (h)}and {tilde over (ĥ)}, whereby a cryptographic key Kc is obtained. The present invention increases the validity of consistent dynamic cryptographic key generating and achieves information security and privacy at the physical layer.