High-Speed Random-Channel Cryptography in Multimode Fibers

Rachel Sampson*, He Wen, Bin Huang, Rodrigo Amezcua Correa, Yaron Bromberg, Hui Cao, Guifang Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We propose and experimentally demonstrate high-speed operation of random-channel cryptography (RCC) in multimode fibers. RCC is a key generation and distribution method based on the random channel state of a multimode fiber and multi-dimension to single-dimension projection. The reciprocal intensity transmittance of the channel shared between the two legitimate users is used to generate and distribute correlated keys. In previous work, RCC's key rate-distance product was limited by the speed of light. In this work, we show that adding a fast modulator at one end of the channel decouples the key rate and distance, resulting in a significant improvement in the key rate-distance product, limited only by the fiber's modal dispersion. Error-free transmission at a key rate-distance product of 64.7 Mbps \times 12 km, which is seven orders of magnitude higher than the previous demonstration, was achieved. The proposed method's security arises from a fundamental asymmetry between the eavesdroppers' and legitimate users' measurement complexity.

Original languageAmerican English
Article number9314050
JournalIEEE Photonics Journal
Issue number1
StatePublished - Feb 2021

Bibliographical note

Publisher Copyright:
© 2009-2012 IEEE.


  • Electro-optical systems
  • fiber optic systems
  • security and encryption


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