Optical fiber safe transmission system based on code-shifting keyed optical encoding and data encryption

Abstract

The invention provides an optical fiber safe transmission system based on code-shifting keyed optical encoding and data encryption. The system comprises an encryption module, an optical transmitter, aCSK optical encoder, a CSK optical decoder, an optical receiver, and a decryption module; the encryption module is used for performing data encryption by using an encryption algorithm, and convertingthe encrypted data into the ciphertext data; the optical transmitter and the CSK optical encoder are used for performing dynamic optical encryption of a physical layer on the ciphertext data; the CSKoptical decoder and the optical receiver are used for correctly recovering a physical layer signal of a user; and the decryption module is used for correctly recovering the user data by adopting thecorresponding data decryption algorithm. The system provided by the invention has the advantages that the CSK optical encoding encryption and the data encryption of the physical layer must be broken at the same time for an eavesdropper, so that the security of the existing optical fiber transmission system is improved; and meanwhile, the multi-user transmission system is realized through the OCDMAmulti-access / multiplexing technology of the physical layer, and the capacity of the optical fiber transmission system is increased.

Description

technical field [0001] The invention relates to the technical field of optical transmission, in particular to an optical fiber security transmission system based on code-shift keying optical coding and data encryption. Background technique [0002] Based on the fact that optical cables have been tapped, the security of optical information transmission in optical fiber communication systems has become an urgent problem to be solved. The safe transmission of optical information requires that its communication system has good security, and it should have the functions of anti-destruction, anti-interception, anti-attack, identity authentication and concealment. [0003] Traditional optical network security employs data encryption in upper-layer protocols of the network and assumes that the physical layer provides unimpeded and error-free transmission. However, all algorithm-based encryption methods have been proven to be broken. For example, in 2009, research teams in Japan, F...

AI Technical Summary

Problems solved by technology

[0006] OCDMA physical layer encryption can improve the security of existing optical fiber communication systems, but it cannot guarantee absolute security, and there is also the possibility of codeword cracking

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