Unit:
Κατεύθυνση Τηλεπικοινωνίες και Επεξεργασία ΣήματοςΠληροφορική
Author:
Stefanakos Nikolaos
Supervisors info:
Συβρίδης Δημήτριος, Καθηγητής, Τμήμα Πληροφορικής και Τηλεπικοινωνιών, ΕΚΠΑ
Μανδηλαρά Αικατερίνη, Δόκτωρ, Τμήμα Πληροφορικής και Τηλεπικοινωνιών, ΕΚΠΑ
Κανέλλος Γεώργιος, Επίκουρος Καθηγητής, Τμήμα Πληροφορικής και Τηλεπικοινωνιών, ΕΚΠΑ
Original Title:
Multi-User Measurement Device Independent Quantum Key Distribution Protocol
Translated title:
Multi-User Measurement Device Independent Quantum Key Distribution Protocol
Summary:
In the realm of modern network communications, ensuring the security of data transmission is paramount, yet typical cryptographic methods fall short of providing unconditional security due to their vulnerability to sophisticated attacks. Quantum Key Distribution (QKD) offers a massive shift by leveraging the fundamental principles of quantum mechanics to facilitate the secure exchange of cryptographic keys, ensuring unbreakable encryption regardless of computational advancements.
This thesis explores the advancements in QKD, particularly focusing on the evolution from traditional QKD protocols to Measurement-Device-Independent QKD (MDI-QKD). MDI-QKD addresses critical security concerns by outsourcing the measurement process to a potentially untrusted third party, thus neutralizing the threat posed by imperfect measurement devices and extending the effective communication range between users.
Building on this foundation, this thesis introduces an extension of an existing MDI-QKD protocol to a three-user configuration, aiming to establish a secure Quantum Conference Key Agreement (QCKA) among the users. This proposed protocol utilizes coherent states, balanced beam-splitters and photon detectors to distribute a common key securely to three users.
This thesis is structured to provide a comprehensive overview of the transition from typical to quantum cryptography, the quantum mechanical and optical principles underlying QKD and the various types of QKD systems and their security challenges. Detailed descriptions of the proposed three-party phase encoding protocol are presented, including a rigorous security proof and the derivation of the related Secure Key Rate (SKR) formula.
Main subject category:
Science
Keywords:
Cryptography, QKD, MDI, QCKA
