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Chaotic encryption method and system based on three-dimensional probability forming

A chaotic encryption and probability technology, applied in the field of optical communication transmission, can solve the problems of large available bandwidth, laser synchronization performance and bandwidth can not meet the demand, etc., to achieve the effect of large key space, good encryption effect and high reliability

Active Publication Date: 2020-06-05
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

At present, the main encryption methods include laser chaos encryption technology and digital chaos method to improve the security of the system, but the use of laser chaos encryption method requires that the lasers at the receiving end and the transmitting end can be synchronized quickly and require a large available bandwidth. At present, the synchronization of lasers Performance and bandwidth are not enough

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  • Chaotic encryption method and system based on three-dimensional probability forming
  • Chaotic encryption method and system based on three-dimensional probability forming
  • Chaotic encryption method and system based on three-dimensional probability forming

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specific Embodiment 1

[0071] combine figure 1 , the present invention proposes a kind of chaotic encryption method based on three-dimensional probability shaping, and described chaotic encryption method comprises the following steps:

[0072] S1. After the serial-to-parallel transformation is performed on the data to be encrypted, the data is mapped to each constellation point formed by three-dimensional probability.

[0073] S2, using the chaotic model of Chua's circuit and the Lorentzian chaotic model to mask the 3D probabilistically shaped constellation diagram.

[0074] Among them, according to the different distances from each constellation point to the origin, the Chua's chaotic model and the Lorentz model are respectively used for masking, so that the three-dimensional probability shaped constellation map becomes two spherical shells.

[0075] The invention performs serial-to-parallel transformation and constellation mapping on the original binary data, then performs constellation masking, ...

specific Embodiment 2

[0110] One of the chaotic encryption methods based on three-dimensional probabilistic shaping is shown in the system structure diagram Figure 8 Shown: A continuous laser with a wavelength of 1551.72nm is used as a light source, and we use the original bit stream with a length of 8192 for further mapping, masking and filtering. The entire algorithm part is realized through digital signal processing in MATLAB, and a 50Gs / s digital-to-analog converter (DAC) is used to generate electrical signals. The generated encrypted signal and the light source are electro-optical modulated in the modulator to generate an optical signal. An optical filter (OF) is used for slicing, producing optical SSB modulation. Then, the optical signal enters the 25km single-mode fiber for transmission after passing through the erbium-doped fiber amplifier. At the receiving end, a variable optical attenuator (VOA) is placed after the fiber for bit error rate (BER) measurement. The optical signal is dire...

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Abstract

The invention discloses a chaotic encryption method based on three-dimensional probability forming, which comprises the following steps: after carrying out serial-parallel change on to-be-encrypted data, mapping the data to each constellation point of three-dimensional probability forming; and masking the constellation diagram of three-dimensional probability forming by utilizing a chaotic model of the Chua's circuit and a Lorentz chaotic model, wherein the Chua's chaotic model and the Lorentz model are respectively adopted for masking according to different distances from each constellation point to an original point, so that the constellation diagram of three-dimensional probability forming is changed into two spherical shells. According to the invention, after spherical three-dimensional probability forming, the transmitting power of the whole system can be greatly reduced, and a new carrier after probability forming has Gaussian energy distribution and is more suitable for transmission of an optical signal in an optical fiber channel; and the Chua's circuit model and the Lorentz model are used for chaotic mapping, compared with a traditional masking mode, the encryption effectis good, and larger key space and higher flexibility are provided.

Description

technical field [0001] The invention relates to the technical field of optical communication transmission, in particular to a chaotic encryption method and system based on three-dimensional probability shaping. Background technique [0002] Optical communication technology plays an important role in our information industry because of its large transmission capacity, fast transmission speed, and long-distance transmission. With the continuous development of 5G, 4K video, cloud computing and other services, the future network traffic will maintain a growth rate of more than 25%, and the huge demand for information capacity will continue to drive the development of long-distance backbone networks and short-distance optical transmission systems. System expansion is an eternal topic. [0003] Probabilistic shaping technology is a new type of coded modulation format that can expand the transmission capacity of optical communication systems based on the system architecture. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/00H04B10/25
CPCH04L9/001H04B10/25
Inventor 刘博忻向军任建新毛雅亚陈帅东王瑞春沈磊李良川周锐王光全吴泳锋孙婷婷赵立龙
Owner NANJING UNIV OF INFORMATION SCI & TECH
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