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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.
Entropy (Basel, Switzerland)
|December 3, 2020
Summary
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.
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.
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