体域网中一种基于无线信道特征的密钥生成方法研究

无线体域网是以人体为中心的无线网络，受其有限的资源和计算能力的约束，如何保证无线体域网通信节点间共享密钥是当前面临的一大挑战。提出了一种基于超宽带无线体域网信道特征的密钥生成机制，利用超宽带信道多径相对时延与平均时延的差值量化生成密钥，降低了密钥不匹配率，同时引入辅助节点，提高了密钥生成速率。仿真结果表明，该机制能够在兼顾密钥一致性的前提下，获得较高的密钥生成速率并保证密钥的安全性。

Research on secret key generation based on wireless channel characteristics in body area network

Wireless body area network (WBAN) is a human-centered wireless network.With limitations of power and computation capabilities of WBAN, the significant challenge of ensuring security is how to generate a shared key between two entities based on a lightweight symmetric cryptography.To investigate this issue, a secret key generation scheme in ultra-wideband (UWB) WBAN was designed.In this scheme, the difference of multipath relative delay and its average value were chosen as common random source to reduce key mismatch probability.Furthermore, with the aid of relay, secret key generation rate could be increased.Simulation and test results demonstrate that the proposed scheme can achieve a good tradeoff between key match probability and key generation rate.Furthermore, security analysis of the scheme was also provided to validate its feasibility.