Communication method for realizing physical layer key distribution based on random self-interference

Abstract

The invention discloses a communication method for realizing physical layer key distribution based on random self-interference. The communication method specifically comprises the following steps that: Alice randomly generates key bits, the key bits are mapped into key symbols, and each key symbol corresponds to a vector for activating different receiving antennas of Bob; Alice selects an activation vector corresponding to a current key symbol, and sends m different data modulation symbols to Bob in a corresponding self-interference mode; Bob measures an average signal-to-noise ratio of each antenna to estimate an antenna vector, and obtains a secret key symbol and a secret key ratio through inverse mapping; and the Bob sequentially demodulates at each activated antenna to obtain a data symbol. According to the communication method, physical layer key distribution can be realized in the process of transmitting one path of data stream, so that key sharing cannot cause communication interruption and time delay, meanwhile, the receiving signal-to-noise ratio of an eavesdropper can be reduced, and the eavesdropping difficulty of the eavesdropper is increased.

Description

technical field [0001] The invention belongs to the field of encrypted communication, in particular to a communication method for realizing physical layer key distribution based on random self-interference. Background technique [0002] With the rapid development of 5G IoT and edge computing networks, a large number of new services and applications are emerging. Various confidential and sensitive data in the wireless network are increasing massively, and the subsequent information security issues are becoming more and more prominent, and security is gradually becoming a prerequisite for various business applications. In traditional wireless communication networks, cryptography-based encryption techniques are usually used at the network layer and upper layers to ensure system communication security. To carry out various encrypted authentications, a secure shared key needs to be established between the communication parties. In a large number of new application scenarios of ...

AI Technical Summary

Problems solved by technology

Since the two parties need to perform at least three interactions on the public channel during the process of establishing the key (including the sending and receiving parties sending pilots to each other, key negotiation, privacy amplification and final consistency confirmation, etc.), the complexity of the communication protocol Higher, the risk of information leakage increases

And because the normal communication process and key distribution cannot be carried out at the same time, resulting in communication interruption or increased delay

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