Physical Layer Key Generation Method For Third-Party Assisted

With the rapid development of the mobile communication industry,the future of 5G network cannot be underestimated.5G wireless communication system is going to introduce D2D(device-to-device)technology to meet the need of business in different network environment.In the open network,we use the key agreement technology to obtain the session key.And,wireless signal encryption is the most effective way to ensure the security of data in D2 D transmission.Aiming at the common problems about long key generation time and poor user experience of key agreement technology,this paper proposed a physical layer key generation method based on third-party assistance.The two sides of the legal communication transmit random sequences synchronously.When the transmitted bits are different,the eavesdropper cannot distinguish the superposition waveform.With the help of the third-party,the legal devices complete the key agreement protocol.Besides,this new key agreement method can improve the key generation rate on the premise of not relying on computing ability.Additionally,this method can provide better user experience and low energy consumption.In view of the fact that the waveforms sent by legal users are not completely consistent,a method of adding random jitter is u to solve the problem of key leakage caused by minor deviation.In addition,in order to against MIMO eavesdropper,a random Manchester coding method is also proposed in this paper.We use the universal software radio equipment to build the experimental platform,and carry on the simulation experiment to the new key agreement method.Results verified the feasibility and correctness of the new key generation method in practice.