A chaotic key distribution system and method based on dispersion keying synchronization

Abstract

The invention belongs to the technical field of secret communication. The invention in particular relates to a chaotic key safety distribution system and method based on dispersion keying synchronization. The problems in the background technology are solved. The system comprises a first DFB laser 1, a first 1*2 optical fiber coupler 2, a CFBG chirped fiber bragg grating 3, a second 1*2 optical fiber coupler 4, a communication party A and a communication party B. Each of the communication party A and the communication party B comprises an optical fiber circulator, an optical switch, a memory,a first dispersion module, a second dispersion module, a photoelectric detector, an analog-to-digital converter and a bit filter. When the optical switch is switched, a random sequence of dispersion feedback can be directly obtained, involved key distribution is not influenced by synchronous recovery time, and the key distribution rate is improved; and, meanwhile, the chaotic light state of the first DFB laser is changed through dispersion feedback, so that the chaotic light directly emitted by the first DFB laser is not related to the chaotic light after dispersion feedback, and the securityof key distribution is enhanced by using nonlinear characteristics.

Description

technical field [0001] The invention belongs to the technical field of secure communication and relates to key distribution, in particular to a chaotic key security distribution system and method based on dispersion keying synchronization. Background technique [0002] To ensure the security of secure communication systems, secure key distribution is crucial. Secure communication between two users in a cryptographic system relies on a secret key known only to both parties. Two users share the key through a secure key distribution scheme. [0003] The security of existing key distribution schemes mainly has two forms: security based on computation and security based on information theory. For computation-based security, it requires the premise that the eavesdropper has limited computation power. For security based on information theory, it does not need to consider the computing power of the eavesdropper. [0004] The basic principle of the calculation-based key distribut...

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Problems solved by technology

[0010] The purpose of the present invention is to solve the problems of low key distribution rate and poor security in the prior art, and provide a chaotic key distribution system and method based on dispersion monitoring synchronization

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