Key Generation Method and Device Based on Optical Fiber Communication Link Polarization Mode Dispersion

Abstract

The invention discloses a key generation method based on the polarization mode dispersion of an optical fiber communication link, including step 1, using a polarization scrambler to disrupt the polarization state in the link; Optical fiber transmission; step 3, the communication parties use the polarization mode dispersion effect of the optical fiber communication link to generate a physical layer encryption key, and perform privacy amplification on the generated initial key bits to obtain the effective information amount of the key; step 4, the transmitter uses The Logistic chaotic system generates random binary bits as the protection key, and performs XOR operation with the key bits generated based on polarization mode dispersion to form double encryption to ensure the uniqueness and randomness of the key; Step 5, the chromatic dispersion, optical fiber Non-linearity and carrier phase noise are compensated at the receiver using digital signal processing. The invention can improve the security of data in optical fiber communication.

Description

Technical field [0001] The present invention belongs to the technical field of communication security, and in particular, a key generation method and apparatus based on a fiber-optic communication link polarization mold dispersion. Background technique [0002] In the information age, especially the rapid development of globalization of cyberspace, communication security has become our very concern. The security of existing communication transmission is generally completed by the application layer's additive algorithm, and its theoretical basis is mathematical calculations, such as large integer decomposition problems and discrete logarithms. However, with the development of high-speed large computers, based on algorithm complexity to ensure the serious threat of failure of classic encryption technology. [0003] Quantum key distribution techniques are theoretically confidential, which utilizes single photons or weak signals, but their key generation rate and transmission distanc...

AI Technical Summary

Problems solved by technology

Because such a chaotic system requires two lasers with exactly the same structural parameters, in real experiments, people use lasers with close structural parameters to achieve chaotic secrecy, but how much difference in parameters can ensure that encrypted signals will not be cracked is still open to question

[0006] 2) The key space of the laser is too small

Communication security needs to replace the key in time, but the structure and working parameters of the laser are limited, such as the laser cavity length, wavelength, carrier lifetime, operating current, etc., so the timely update of the key cannot be guaranteed

[0007] 3) After the point-to-point experiment is successful, how to construct an optical network for application remains to be studied

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