结合无条件安全传输的密钥一致性确认方法

Key Consistency Confirmation Combining Unconditional Secure Transmission

基于无线信道的互易性和信道特征随机性提取密钥,是代替传统密钥的可行性选择。完整的密钥生成技术包括信道探测、信道特征提取、量化、信息协商、保密增强五个阶段,可以利用MIMO-OFDM系统信道频域响应实现前三个阶段。MIMO-Beamforming与安全编码结合的无条件安全传输模式,可以实现安全可靠的传输。理论上,信息协商和保密增强阶段可以利用无条件安全传输方式进行密钥一致性协商和确认,以简化密钥提取过程。利用MIMO-Beamforming与安全编码结合的无条件安全传输模式进行密钥一致性协商和确认,是一种针对被动窃听的密钥分发方式,这里分析和仿真验证了该方式的可靠性和安全性。

The key extraction based on the reciprocity of the wireless channel and the randomness of the channel characteristic is a feasible choice in replacement of the traditional key. The complete key generation technologies involves five steps, including channel probing, randomness extraction, quantification, information reconciliation and privacy enhancement, and the first three steps may be realized with MIMO-OFDM system channel frequency domain response. Unconditional secure transmission mode in combination of MIMO-Beamforming with security code can implement safe and reliable transmission. Theoretically, the information reconciliation and privacy enhancement may take advantage of the unconditional communication security to confirm key consistency, thus to simplify the key extraction process. This key extraction method, implementing information reconciliation and key consistency confirmation via the unconditional communication security achieved by combing MIMO-Beamforming with security code, is a key distribution mode to solve the problem of passive eavesdropping. Simulation and analysis indicate the reliability and safety of the proposed method.