A Chaos Encryption Method and System Based on 3D Probabilistic Forming

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

Active Publication Date: 2022-07-08
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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  • A Chaos Encryption Method and System Based on 3D Probabilistic Forming
  • A Chaos Encryption Method and System Based on 3D Probabilistic Forming
  • A Chaos Encryption Method and System Based on 3D Probabilistic Forming

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specific Embodiment 1

[0070] combine figure 1 , the present invention proposes a chaotic encryption method based on three-dimensional probability shaping, and the chaotic encryption method comprises the following steps:

[0071] S1, after serial-parallel transformation of the data to be encrypted, map the data to each constellation point formed by three-dimensional probability.

[0072] S2, using the Chaos model of Chua's circuit and the Lorentz Chaos model to mask the constellation diagram formed by the three-dimensional probability.

[0073] Among them, according to the different distances from each constellation point to the origin, the Chua's chaotic model and the Lorentz model are used for masking, so that the constellation diagram formed by the three-dimensional probability becomes two spherical shells.

[0074] The invention performs serial-parallel transformation and constellation mapping on the original binary data, performs constellation masking, and uses three-dimensional probability sh...

specific Embodiment 2

[0108] The system structure diagram of one of the chaotic encryption methods based on three-dimensional probability shaping is shown in Fig. Figure 8 Shown: A CW laser with a wavelength of 1551.72 nm is used as the light source, and we use the raw bitstream of length 8192 for further mapping, masking and filtering. The whole algorithm part is realized by digital signal processing in MATLAB, and a 50Gs / s digital-to-analog converter (DAC) is used to generate electrical signals. The resulting encrypted signal is electro-optically modulated with the light source in a modulator to generate an optical signal. An optical filter (OF) is used for slicing, resulting in optical SSB modulation. Then, the optical signal enters a 25km single-mode fiber for transmission after passing through an erbium-doped fiber amplifier. At the receiving end, a variable optical attenuator (VOA) is placed behind the fiber for bit error rate (BER) measurements. The optical signal is directly detected by...

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Abstract

The invention discloses a chaotic encryption method based on three-dimensional probability shaping. The Lenz chaos model masks the constellation diagram formed by the three-dimensional probability; among them, according to the different distances from each constellation point to the origin, the Chua's chaotic model and the Lorentz model are used for masking, so that the three-dimensional probability forming constellation diagram becomes two spherical. The invention can greatly reduce the transmission power of the whole system after the spherical three-dimensional probability shaping, and the new carrier wave after the probability shaping will have a Gaussian energy distribution, which is more suitable for the transmission of optical signals in the optical fiber channel; using Chua's circuit model and Compared with the traditional masking method, the Lorentz model for chaotic mapping has a good encryption effect, and provides a larger key space and greater flexibility.

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 due to its large transmission capacity, fast transmission speed, and long-distance transmission. With the continuous development of 5G, 4K video, cloud computing and other services, network traffic will maintain a growth rate of more than 25% in the future. The huge demand for information capacity continues to drive the development of long-distance backbone networks and short-distance optical transmission systems. Optical communication System expansion is an eternal topic. [0003] Probabilistic shaping technology is a new type of coded modulation format, which can expand the transmission capacity of optical communication systems on the basis of system a...

Claims

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Application Information

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Patent Type & Authority Patents(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王光全吴泳锋孙婷婷赵立龙
Owner NANJING UNIV OF INFORMATION SCI & TECH
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