基于空域对称加扰和安全极化编码的无协商密钥生成方法

Nonagreement secret key generation based on spatial symmetric scrambling and secure polar coding

针对现有密钥生成方法流程繁琐的问题,本文利用空域对称加扰和安全极化编码提出了一种无协商的密钥生成方法,仅需安全传输和隐私放大两步即可生成密钥.首先,空域对称加扰以类信号噪声代替传统的Gauss噪声具有更高的安全性并为合法信道提供了信道优势,保证了安全容量的存在性;然后,基于该信道优势和系统性能需求提出了基于Gauss近似和遗传算法的安全极化码构造算法,确保了传输比特的安全性;最后,利用安全极化编码和空域对称加扰实现了私密比特的安全传输,并对其进行隐私放大生成密钥.仿真结果验证了空域对称加扰和安全极化编码的有效性,并进一步说明了所提密钥生成方法能够满足系统性能的需求. NIST测试结果表明了生成的密钥具有很强的随机性.

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.