Physical layer secure transmission method based on noise distribution

Abstract

The invention discloses a physical layer secure transmission method based on noise distribution. A security cooperation node SCN is introduced to distribute an artificial noise signal to a legal user;the SCN combines the local secret key with the random secret key of the legal user and then generates a random interference noise signal in a Hash mapping mode; an interference noise signal and an artificial noise signal used for confidential information transmission are sent to the legal user at the same time; the legal user can eliminate the influence of interference noise to obtain an artificial noise signal required by safe transmission. According to the method, the fact that an eavesdropper cannot eliminate noise interference is guaranteed, so that the eavesdropper generates an error code platform, and then safe transmission of a wireless system is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a physical layer security transmission method based on noise distribution. Background technique [0002] Traditional wireless encryption methods mainly rely on upper-layer digital encryption algorithms, such as symmetric encryption algorithms AES, DES, etc., which can achieve fast and effective security encryption, but such algorithms have problems such as encryption key management and distribution difficulties. Digital key encryption algorithms are based on computational complexity theory to ensure the security of information transmission, and this security is based on the assumption of an ideal physical layer, that is, the physical layer can perform error-free transmission. [0003] With the advent of the era of big data, malicious eavesdroppers can also easily have powerful cluster computing capabilities. At this time, traditional key encryption meth...

AI Technical Summary

Problems solved by technology

At present, the research on artificial noise is mainly realized by transmitting artificial noise through the null space of the main channel, but it is difficult to ensure that the transmitter can accurately obtain the channel state information in the actual system. Interference affects normal communication

Some studies use the sending node and the destination node to cooperate to send artificial noise signals to interfere with potential untrusted relay nodes, but such studies have not fully considered the eavesdropper's eavesdropping ability. The direction of the eavesdropping antenna is aimed at the legitimate user. At this time, the artificial noise signal may not be able to effectively interfere with the eavesdropper

Images