Cross-layer encryption method for fiber transmission system and cross-layer encryption system

Abstract

The invention provides a cross-layer encryption method for a fiber transmission system and a cross-layer encryption system. The cross-layer encryption method comprises steps of data encryption, light coding, light decoding, recovery and data decryption. The cross-layer encryption method is advantaged in that for an eavesdropping user, both light coding encryption and data encryption at a physical layer must be cracked, so safety of a fiber transmission system in the prior art is improved, moreover, through the OCDMA multi-access / reuse technology of the physical layer, a multi-user transmission system is realized, capacity of the fiber transmission system is improved, and the cross-layer encryption method is especially suitable for safe transmission of the important information of light transmission networks and access networks of special mechanisms including police, bank and government occasions, and has urgent market demands and wide application prospects.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a cross-layer encryption method and system of an optical fiber transmission system. Background technique [0002] The current optical cable is easy to be eavesdropped, and the security problem of optical information transmission in the optical fiber communication system needs to be solved urgently. 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, France and Germany broke the 768-b...

AI Technical Summary

Problems solved by technology

Quantum cryptography communication based on the physical "uncertainty" and "inseparable" principles has absolute security, but due to the limitation of physical mechanism, the current quantum communication technology is only suitable for low-speed signal transmission

On the other hand, 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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