METHOD FOR GENERATING CONSISTENT CRYPTOGRAPHIC KEY BASED ON WIRELESS CHANNEL FEATURES

摘要

The present invention discloses a method for generating consistent cryptographic key based on wireless channel features, including: both an end A and an end B of communication performing channel estimation respectively, and obtaining channel estimation values h a and h b as well as channel estimation mean square error MSE; performing quantization encoding, and obtaining quantized channel eigenvectors h~ a and h~ b ; for the inconsistency between h~ b and h~ a , h~ b being h~ a being equivalent to one obtained from adding h~ a with noise by a virtual channel, and determining the signal to noise ratio G of the virtual channel; determining an encoding scheme ENC according to the signal to noise ratio G of the virtual channel; the end A and the end B performing encoding and decoding respectively according to the ENC, and obtaining an estimation value (H) of h~ a ; the end A and the end B applying a cryptographic key generation function to h~ a and (H) respectively to obtain the cryptographic key Kc. The present invention promotes the validity of consistent cryptographic key generation and ensures information security at physical layer.