A Packet Physical Layer Encryption Method Based on Matrix Transformation
An encryption method and matrix transformation technology, which is applied in the field of packet physical layer encryption based on matrix transformation, can solve the problem of channel information not being secure, and achieve the goal of increasing the difficulty of deciphering, multiple degrees of freedom, large ciphertext space and key space Effect
Active Publication Date: 2021-01-26
NAT UNIV OF DEFENSE TECH
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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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[0051] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0052] Such as image 3 Shown is a flow chart of the physical layer encryption method of the present invention, which mainly includes the following steps:
[0053] (1) Transform the plaintext signal S into an information sequence S' through bits;
[0054] S is a binary array whose length is M, and the bit transformation stage adopts one or more of Boolean functions such as interleaving, XOR, and permutation in the prior art to realize the following transformations:
[0055] S={s 1 ,s 2 ,...,s M}→S'={s' 1 ,s' 2 ,...,s' M}
[0056] XOR: Use the key Key1 to generate a pseudo-random number sequence and S bit-by-bit XOR. The generation method of the pseudo-random number sequence is an existing technology, and methods such as linear feedback shift registers (LFSR) can be used (specific reference: https: / / en.wikipedia.org / wiki / Linear-feedba...
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The invention belongs to the technical field of communication signal encryption and specifically designs a packet physical layer encryption method based on matrix transformation. The method includes the following steps: (1) converting the plaintext signal S into an information sequence S' through bits; (2) modulating the information sequence S' to obtain modulation information X; (3) performing modulation on the modulation information X according to the key information Block transformation, output ciphertext signal Y. The present invention also provides a packet physical layer encryption method based on block chaining mode, which adds a logical operation vector on the basis of the packet physical layer encryption method based on matrix transformation, so that each ciphertext block depends on all the plaintext blocks in front of it . The present invention has larger ciphertext space and key space, increases the difficulty of deciphering, can resist known plaintext attack and selective plaintext attack, can protect training symbols, bit error rate performance is not lost, and constellation map confusion degree High, the constellation information is well protected.
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...
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IPC IPC(8): H04L29/06H04L9/08H04L27/26
CPCH04L9/0861H04L9/0869H04L27/2695H04L63/0428
Inventor 李为雷菁鲁信金黄英王思鑫
Owner NAT UNIV OF DEFENSE TECH