Physical layer secure transmission method based on an asymmetric key

Abstract

The invention belongs to the technical field of communication security, and particularly relates to a physical layer secure transmission method and system based on an asymmetric key. The method comprises the following steps that a sender maps and converts binary information Sb into a complex vector signal X, the complex vector signal X is encrypted through a security matrix U, the complex vector signal X is converted into a complex vector signal Y, Y = UX, and the complex vector signal Y is sequentially processed through an IFFT module, a cyclic prefix adding module and a DAC module and then sent out through a radio frequency module; a receiver receives a signal through the radio frequency module, the signal is processed through the ADC module, the cyclic prefix removal module and the FFTconversion module to obtain a complex vector signal Y ', the complex vector signal Y' is decrypted through the security matrix to obtain a complex vector signal X ', and binary information is furtherrecovered through demapping. The physical layer secure transmission system comprises a sending end, a transmission channel and a receiving end. According to the invention, ciphertext attacks, known plaintext attacks and selective plaintext attacks can be resisted, and a stronger security effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of communication security, and in particular relates to a physical layer secure transmission method and system based on an asymmetric key. Background technique [0002] With the rapid development of 5G wireless communication technology, its communication security has become an important issue. At the same time, various encryption algorithms have become the most important components in all security architectures. However, a series of symmetric encryption algorithms used in LTE systems have encountered challenges in 5G scenarios, such as SNOW 3G, ZUC and AES. The new 5G wireless communication scenario includes three main application scenarios: enhanced mobile broadband (eMBB), machine type communication (MTC) and ultra-reliable and low-latency communication (URLLC), these new scenarios have proposed new security requirements . [0003] Both the traditional secure communication system and the physical layer ...

AI Technical Summary

Problems solved by technology

Although there are already a large number of specific application solutions for physical layer encryption (PLE), it is difficult to manage and store a large number of keys when the number of users in the communication system is large.

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