移动无线网络中物理密钥技术研究

项目名称： 移动无线网络中物理密钥技术研究

项目编号： No.61501512

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 管新荣

作者单位： 中国人民解放军陆军工程大学

项目金额： 23万元

中文摘要： 移动通信的蓬勃发展对无线安全性提出了更高要求，而由计算复杂度保证的传统密钥体制正随计算机运算能力的提升不断受到挑战。基于无线信道物理特性进行密钥生成具有在线分发、实时更新等特点，为解决上述问题提供了新的可能。本课题将结合移动无线网络特点，考虑不同的信道互易性条件，研究物理密钥生成方法，完善物理密钥安全度量体系，并探讨所生成密钥与现有密钥体系的有效融合问题。具体研究内容如下：1）密钥生成：针对完美互易、非完美互易以及非互易信道三种条件设计相应的物理密钥生成方法；2）性能评估：分析用户移动性以及位置相关性对物理密钥安全性能的影响，推导密钥生成速率、安全性、一致性以及用户体验之间的折衷关系，完善物理密钥性能评估体系；3）融合机制：探索物理层密钥与传统密钥的有效融合问题，结合协议上层服务需求，建立基于反馈的动态融合机制。

中文关键词： 移动无线网络；物理密钥；对称信道

英文摘要： Higher secrecy is required as the booming development of mobile communications. The traditional computation complexity based key cryptography is being challenged because the computational power and speed increases largely. Exploiting the physical characteristics of the wireless channel to generate the socalled physical key has the superiority of online distribution and dynamic refreshing, which provides a new insight in solving the secrecy problem. Considering the feature of mobile wireless networks, this proposal will investigate how to generate physical key under different channel reciprocity conditions. And the secrecy evaluation system would be advanced. Furthermore, how physical key and traditional key merge to achieve higher secrecy would also be solved. Specifically, the research contains the following three parts. 1) Key generation: Three schemes are designed for perfect reciprocal channel, imperfect reciprocal channel, and non-reciprocal channel, respectively. 2) Performance evaluation: The effects of user mobility and space correlation on the secrecy of physical key are studied. And the performance measuring system is advanced through establishing the trade-off between the key rate, secrecy, consistency and the user experience. 3) Merging mechanism: Physical key should merge with traditional key cryptography to compensate its shortage. And the merging mechanism should dynamically adjust itself to satisfy the service requirements from high layers.

英文关键词： mobile wireless networks;physical key;reciprocal channel