Packet physical layer encryption method based on matrix transformation

Abstract

The invention belongs to the field of communication signal encryption technology, and specifically designs a packet physical layer encryption method based on matrix transformation. The method comprises the following steps: (1) transforming plaintext signals S into an information sequence S' through bits; (2) modulating the information sequence S' to obtain modulation information X; and (3) performing block transformation on the modulation information X according to key information to output ciphertext signals Y. The invention also provides a packet physical layer encryption method of a block chaining mode, which adds a logical operation vector based on the matrix physical layer encryption method based on matrix transformation, so that each ciphertext block depends on all plaintext blocks in front. The method has larger ciphertext space and key space, increases the difficulty of deciphering, can resist known plaintext attacks and selective plaintext attacks, can protect training symbols, and has no loss on bit error rate performance but high constellation map chaos, and well protects constellation information.

Description

technical field [0001] The invention belongs to the technical field of communication signal encryption and specifically designs a packet physical layer encryption method based on matrix transformation. Background technique [0002] With the rapid development of wireless communication technology, its communication security has become an important issue. Compared with the traditional upper-layer encryption mechanism, the motivation for providing security at the physical layer is that it has the least impact on the network, has the advantages of low latency and low overhead, and can be used as a supplement to the upper-layer encryption scheme to enhance the security of wireless communication. Physical layer encryption does not depend on channel conditions and can provide security when eavesdroppers outperform legitimate ones. Compared with traditional cryptography, which only considers perfect channels, it can take advantage of the influence of channels and noise, which can ho...

AI Technical Summary

Problems solved by technology

Physical layer security provides security based on information theory. No key is used in physical layer security. The problem in practical applications is that real security cannot be obtained when channel information is uncertain. It is essentially a kind of security in the sense of probability

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