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Attacks against a Simplified Experimentally Feasible Semiquantum Key Distribution Protocol.

Michel Boyer1, Rotem Liss2, Tal Mor2

  • 1Département d'Informatique et de Recherche Opérationnelle (DIRO), Université de Montréal, Montréal, QC H3C 3J7, Canada.

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A simplified semiquantum key distribution (SQKD) protocol is shown to be insecure. This research demonstrates attacks, proving the complexity of existing robust SQKD protocols is necessary for security.

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attackquantum key distributionsecuritysemiquantum key distribution

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Area of Science:

  • Quantum Information Science
  • Cryptography
  • Computer Science

Background:

  • Semiquantum key distribution (SQKD) enables secret key generation between quantum and classical parties.
  • Current SQKD protocols often lack experimental feasibility or security.
  • A robust but complex "Mirror protocol" exists, offering a secure solution.

Purpose of the Study:

  • To evaluate the security of a simplified variant of the "Mirror protocol" for SQKD.
  • To determine if reduced complexity compromises the security of SQKD protocols.

Main Methods:

  • Theoretical analysis of a simplified "Mirror protocol" variant.
  • Development and presentation of two novel attack strategies against the simplified protocol.

Main Results:

  • The simplified "Mirror protocol" is proven to be completely non-robust.
  • The presented attacks demonstrate practical vulnerabilities in the simplified protocol.
  • The complexity of the original "Mirror protocol" is shown to be essential for its robustness.

Conclusions:

  • Simplified SQKD protocols may not achieve the necessary security guarantees.
  • The inherent complexity in robust SQKD protocols like the "Mirror protocol" is a critical factor for security.
  • Further research is needed to balance security and feasibility in SQKD.