Resilience to Passive Attacks of a Secure Key Distribution System Based on an Ultra-Long Fiber Laser Using a Bi-Directional EDFA

In this paper, we study the implementation of a secure key distribution system based on an ultra-long fiber laser with a bi-directional erbium-doped fiber amplifier. The resilience of the system was tested against passive attacks from an eavesdropper. A similarity was observed in the spectra for both secure configurations of the system and no signature that would allow an eavesdropper to obtain the secure state of the system was observed during the state transitions.

Automated summary

This paper investigates the implementation of a secure key distribution system using an ultra-long fiber laser and a bi-directional erbium-doped fiber amplifier. The system's resilience to passive attacks from eavesdroppers is tested, and it is observed that the spectra of both secure system configurations are similar with no indication for eavesdroppers to determine the secure state during state transitions.