Abstract
Most existing secret key generation (SKG) methods are complicated and depend on the security capacity. This study aims to propose a non-agreement SKG method based on spatial symmetric scrambling (SSS) and secure polar coding (SPC), which only consists of secure transmission and privacy amplification. First, SSS provides a channel advantage and high security by replacing traditional Gaussian artificial noise with signal-like noise to ensure the existence of secure capacity. Second, the SPC is designed through Gaussian approximation and generic algorithm based on the acquired channel advantage and desired SKG performance to guarantee the security of transmitted information. Finally, the secret information is safely transmitted through SPC and SSS, and secret keys can be further generated by privacy amplification. The simulated results verify the feasibility of SSS and SPC and further illustrate that the proposed SKG method can meet the designed performance requirement. The National Institute of Standards and Technology test is also conducted and the results show the strong randomness of the generated keys.
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