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Entropy 2015, 17(5), 2723-2740;

Finite Key Size Analysis of Two-Way Quantum Cryptography

Faculty of Science, International Islamic University Malaysia (IIUM), Jalan Sultan Ahmad Shah, Bandar Indera Mahkota, 25200 Kuantan, Pahang, Malaysia
School of Science & Technology, University of Camerino, I-62032 Camerino, Italy
INFN-Sezione di Perugia, Via A. Pascoli, I-06123 Perugia, Italy
Author to whom correspondence should be addressed.
Received: 6 March 2015 / Revised: 13 April 2015 / Accepted: 23 April 2015 / Published: 30 April 2015
(This article belongs to the Special Issue Quantum Cryptography)
Full-Text   |   PDF [557 KB, uploaded 30 April 2015]


Quantum cryptographic protocols solve the longstanding problem of distributing a shared secret string to two distant users by typically making use of one-way quantum channel. However, alternative protocols exploiting two-way quantum channel have been proposed for the same goal and with potential advantages. Here, we overview a security proof for two-way quantum key distribution protocols, against the most general eavesdropping attack, that utilize an entropic uncertainty relation. Then, by resorting to the “smooth” version of involved entropies, we extend such a proof to the case of finite key size. The results will be compared to those available for one-way protocols showing some advantages. View Full-Text
Keywords: quantum cryptography; quantum measurement theory; entropy and other measures of information quantum cryptography; quantum measurement theory; entropy and other measures of information
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Shaari, J.S.; Mancini, S. Finite Key Size Analysis of Two-Way Quantum Cryptography. Entropy 2015, 17, 2723-2740.

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