Physical layer key extraction method based on channel characteristic

Abstract

The present invention provides a physical layer key extraction method based on a channel characteristic. Two legitimate communications parties obtain a channel characteristic sequence through channel estimation, then an improved level-crossing algorithm is introduced to carry out screening and cumulative processing on the channel characteristic sequence, and the channel characteristic sequence is updated. KL transform is used to remove the correlation between updated channel characteristic sequence sample values. Finally, a multi-bit adaptive quantization (MAQ) scheme is used to quantize the channel characteristic sequence with correlation removal as a key bit string. An experimental result shows that the method has a higher key generation rate than a level-crossing key generation program and has better key inconsistency rate than a HRUBE scheme, a random need is satisfied by the key bit string generated by the scheme, and key enhancement processing is not needed.

Description

technical field [0001] The invention belongs to the field of physical layer security in wireless communication technology, and relates to an improved key generation method based on wireless channel reciprocity, in particular to a physical layer key extraction method based on channel characteristics. Background technique [0002] In recent years, with the rapid development of wireless mobile communications, the number of users and the scope of applications of wireless networks have been increasing, and the security of wireless communications has also attracted more and more attention. Most of the traditional security methods rely on authentication and encryption technology, implemented through the upper layer protocol of the network, and are relatively independent from the physical layer. In view of the openness and broadcast nature of wireless communication, the computing security provided by traditional algorithms has been widely questioned by the industry. Therefore, rese...

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Problems solved by technology

The inconsistency rate of the key bit string generated by this scheme is low, and the implementation is simple, but the key generation rate is low

[0005] In order to improve the key generation rate, N.Patwari et al. proposed the HRUBE scheme in 2009, [N.Patwari, J.Croft, and S.Jana, "High-rate uncorrelated bit extraction for shared secret key generation from channel measurements ,"IEEE Trans.Mobile Comput.,vol.9,pp.17–30,Jan.2009.] This scheme proposes a multi-bit adaptive quantization scheme (MAQ), which can propose multiple 1-bit key greatly increases the key generation rate, but its disadvantage is that the key inconsistency rate generated by both communication parties is high, and the generated key string needs to be enhanced to remove redundant information.

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