A Quantum Key Distribution Protocol for Rapid Denial of Service Detection

Alasdair Price, John Rarity, Chris Erven

Research output: Contribution to journalArticle (Academic Journal)

116 Downloads (Pure)


We introduce a quantum key distribution protocol designed to expose fake users that connect to Alice or Bob for the purpose of monopolising the link and denying service. It inherently resists attempts to exhaust Alice and Bob's initial shared secret, and is 100% efficient, regardless of the number of qubits exchanged above the finite key limit. Additionally, secure key can be generated from two-photon pulses, without having to make any extra modifications. This is made possible by relaxing the security of BB84 to that of the quantum-safe block cipher used for day-to-day encryption, meaning the overall security remains unaffected for useful real-world cryptosystems such as AES-GCM being keyed with quantum devices.
Original languageEnglish
Number of pages13
Publication statusE-pub ahead of print - 13 Nov 2017

Structured keywords

  • Bristol Quantum Information Institute
  • QETLabs
  • Photonics and Quantum


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