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IEEE International Conference on Communication Technology (ICCT)

Quantum cryptographic key distribution in multiple-access networks

S.T. Faraj, Fawzi M. Al-Naima, Siddeeq Y. Ameen

Published Nov 7, 2002• 4 citations
Publisher

Abstract

The purpose of quantum key-distribution is for two or more correspondents, who share no secret information initially, to agree on random keys, which remain secret against attacks from more powerful analytic or computational tools. Quantum cryptography protocols can be designed to offer guaranteed security services in optical communication networks. The paper briefly outlines a general procedure for modeling and simulation of quantum key distribution protocols in multiple-access networks. Each communication network model is assumed to be composed of communication nodes (stations) that are connected by links. There are three basic communication node models, which are quantum transmission (QT), quantum reception (QR), and quantum transmission reception (QTR) nodes. In the models, fiber optic channels (links) are assumed to be used for connecting communication nodes.

DOI
10.1109/icct.2000.889166

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The purpose of quantum key-distribution is for two or more correspondents, who share no secret information initially, to agree on random keys, which remain secret against attacks from more powerful analytic or computational tools. Quantum cryptography protocols can be designed to offer guaranteed security services in optical communication networks. The paper briefly outlines a general procedure for modeling and simulation of quantum key distribution protocols in multiple-access networks. Each communication network model is assumed to be composed of communication nodes (stations) that are connected by links. There are three basic communication node models, which are quantum transmission (QT), quantum reception (QR), and quantum transmission reception (QTR) nodes. In the models, fiber optic channels (links) are assumed to be used for connecting communication nodes.
Abstract The paper presents some secure optical network models. The security of the models is achieved using quantum cryptographic-key distribution. Both point-topoint and multiple-access broadcast networks are considered. In the modeling of these networks, the simplicity, generality and flexibility are highly maintained. This enables the efficient use of these models for software simulation purposes. Each secure optical communication network model is assumed to be composed of N communication nodes (stations) that are connected by fiber-optic links. Some hardware requirements are briefly explained. Also, samples of simulation results for these network models are presented.
In this thesis, several novel secure optical communication network models are presented. The security of these network models is achieved using quantum cryptographic-key distribution. Both point-to-point and multiple access broadcast networks are considered. Furthermore, in developing these models, the simplicity, generality and flexibility are highly maintained. Thus, it is possible to use these models efficiently for software simulation purposes. Each secure optical communication network model is assumed to be composed of N communication nodes (stations) that are connected by three types of fiber optic channels. These are the quantum, authenticated public, and timing channels. Errors can occur in quantum transmission due to eavesdropping and system inefficiencies. Thus, an error elimination technique is implemented. In this technique, several rounds of random permutations and block parity comparisons are done between the transmitter and receiver. Then, another strategy of random subset parity comparisons is performed. Blocks or subsets of discordant parities are subjected to a bisective search to find error locations and eliminate them. After all quantum transmission errors are discovered and discarded, an important mathematical technique called privacy amplification is implemented. Using this technique, eavesdropper information about the final cryptographic key is reduced to an arbitrarily value smaller than one bit. This is essentially achieved by publicly choosing length-reducing transformations to apply to primary keys so that partial eavesdropper information about inputs conveys almost no knowledge of the outputs. In the designing of secure models for multiple access broadcast networks, both of broadcasting and multicasting quantum transmission modes are enabled. This is done via introducing electro-optic switches in the implementation of quantum channels. Hence, the efficiency of quantum cryptography protocols can significantly be increased, in many situations. All networks quantum cryptography protocols are simulated via the object oriented programming (OOP) approach using the Borland C ++ Compiler Version 4.5. Simulation results for both error elimination and privacy amplification stages are presented. It is important to mention that all the described protocols are secure even against an enemy possessing unlimited computing power.
The increasing reliance on optical communication networks for high-speed data transmission has amplified concerns regarding secure information exchange in the era of quantum computing. Classical cryptographic protocols such as RSA and ECC, though widely deployed, are vulnerable to attacks from large-scale quantum computers executing Shor’s algorithm. Quantum Key Distribution (QKD) has emerged as a revolutionary cryptographic paradigm that leverages the principles of quantum mechanics to enable theoretically unbreakable key exchange. This paper investigates the integration of QKD into optical communication networks, focusing on protocol design, implementation challenges, and potential scalability. Through scenario-based evaluation, the study highlights the trade-offs between quantum security and practical deployment constraints such as channel loss, photon detector efficiency, and key generation rates. Results from simulated models demonstrate that while QKD can achieve provable security in metropolitan-area networks, long-distance transmission requires advanced techniques such as quantum repeaters and trusted nodes. This work concludes that QKD offers a promising pathway toward quantum-safe communication but necessitates
The increasing reliance on optical communication networks for high-speed data transmission has amplified concerns regarding secure information exchange in the era of quantum computing. Classical cryptographic protocols such as RSA and ECC, though widely deployed, are vulnerable to attacks from large-scale quantum computers executing Shor�s algorithm. Quantum Key Distribution (QKD) has emerged as a revolutionary cryptographic paradigm that leverages the principles of quantum mechanics to enable theoretically unbreakable key exchange. This paper investigates the integration of QKD into optical communication networks, focusing on protocol design, implementation challenges, and potential scalability. Through scenario-based evaluation, the study highlights the trade-offs between quantum security and practical deployment constraints such as channel loss, photon detector efficiency, and key generation rates. Results from simulated models demonstrate that while QKD can achieve provable security in metropolitan-area networks, long-distance transmission requires advanced techniques such as quantum repeaters and trusted nodes. This work concludes that QKD offers a promising pathway toward quantum-safe communication but necessitates advancements in hardware, standardization, and hybrid cryptographic strategies for widespread adoption.
The secure distribution of the secret random bit sequences known as `key' material, is an essential precursor to their use for the encryption and decryption of confidential communications. Quantum cryptography is an emerging technology for secure key distribution with single-photon transmissions: Heisenburg's uncertainty principle ensures that an adversary can neither successfully tap the key transmissions, nor evade detection (eavesdropping raises the key error rate above a threshold value). We have developed experimental quantum cryptography systems based on the transmission of non-orthogonal single-photon states to generate shared key material over multi-kilometer optical fiber paths and over line-of-sight links. In both cases, key material is built up using the transmission of a single- photon per bit of an initial secret random sequence. A quantum-mechanically random subset of this sequence is identified, becoming the key material after a data reconciliation stage with the sender. In our optical fiber experiment we have performed quantum key distribution over 24-km of underground optical fiber using single-photon interference states, demonstrating that secure, real-time key generation over `open' multi-km node-to-node optical fiber communications links is possible.
Secure networks composed of optical networks and quantum key distribution (QKD) are considered in this paper. A network layer structure is defined to focus on issues important with respect to the QKD network layer that controls QKD links and supplies a secure key for message transmission. A multiple-user QKD network layer can be constructed with timing synchronization, secure key sharing between indirectly connected nodes with switched QKD systems and key relays, and key management to control the volume of key generation and supply in response to the demand from optical network nodes.