Packet physical layer encryption method based on matrix transformation

An encryption method and matrix transformation technology are applied in the field of packet physical layer encryption based on matrix transformation, which can solve the problem that channel information cannot be secured, and achieve the effects of increasing the difficulty of deciphering, multiple degrees of freedom, and high degree of confusion.

Active Publication Date: 2018-11-16
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Packet physical layer encryption method based on matrix transformation
  • Packet physical layer encryption method based on matrix transformation
  • Packet physical layer encryption method based on matrix transformation

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Embodiment Construction

[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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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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
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