Secret key generation method based on wireless channel characteristics in frequency division duplex system

Abstract

The invention provides a secret key generation method based on wireless channel characteristics in a frequency division duplex system. The secret key generation method comprises the following steps: carrying out channel estimation by both communication parties respectively to obtain channel state information of an uplink of the same moment; extracting a certain characteristic parameter from the estimated channel state information respectively and quantifying; carrying out consistency negotiation according to a quantifying value; and carrying out mapping according to a negotiation value and the quantifying value to obtain a consistency secret key. According to the method disclosed by the invention, the obtained secret key has randomness and privacy and can be updated in real time, so that the safety of the secret key is greatly enhanced, and the secret key can be better applied even under a high-speed moving environment; and meanwhile, compared with an existing wireless communication system, the method has better compatibility and has a better market application value.

Description

technical field [0001] The present application relates to the field of information encryption, and in particular to a key generation method under a Frequency Division Duplex (FDD, Frequency Division Duplex) system. Background technique [0002] With the rapid development of computer and communication technology, wireless communication network has become a research hotspot and the most rapid growth point in the field of communication, accompanied by the security problems it faces, which must be solved. [0003] As we all know, the channel of wireless communication is open, and users can roam, which causes the security threat of wireless communication system to be far greater than that of wired communication system. Any intruder can easily intercept the wireless transmission signal without being detected. If the transmitted signal is not well protected, it will easily cause information leakage. [0004] The security mechanism of the current wireless communication system is ba...

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Problems solved by technology

[0010] The main purpose of this application is to provide a consistent key generation method based on wireless channel characteristics under the FDD system, which enables both communication parties to safely obtain the state information of the same channel at the same time and then generate a consistent key, which solves the problem of the FDD system. It is difficult to use wireless channel characteristics to generate keys to ensure communication security due to the failure of channel reciprocity

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