Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 80 for “"key distribution"”.
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Optically Switched Quantum Key Distribution Network
… vital to modern communication networks. Quantum Key Distribution (QKD) is a promising method based on the quantum properties of light to generate and distribute unconditionally secure keys for use in classical data encryption. Significant progress has been achieved in the performance of QKD …
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Integrated optical components for quantum key distribution
The security of current public key cryptosystems, such as RSA, depends on the difficulty of computing certain functions known as trapdoor functions. However, as computational resources become more abundant with the fast development of super- and quantum computers, relying on such methods for …
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A multi-protocol quantum key distribution transmitter
Quantum key distribution (QKD) is a technology that allows two users to communicate with theoretically perfect security using standard optical fibres. This is possible by transmitting the key on single photons, meaning a measurement by an eavesdropper disturbs the system in a way observable to the …
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High-dimensional entanglement-based quantum key distribution
Conventional quantum key distribution (QKD) uses a discrete two-dimensional Hilbert space for key encoding, such as the polarization state of a single photon. In contrast, high-dimensional QKD allows encoding onto a larger state space, such as multiple levels of a continuous variable of a single …
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Soft Processing Techniques for Quantum Key Distribution Applications
… reconciliation and data sifting for Quantum Key Distribution (QKD). A novel composite channel model for QKD is identified, which includes both a hard output quantum channel and a soft output classic channel. The Log-Likelihood Ratios, - also called soft-metrics - derived from the two channels …
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High-dimensional Quantum Key Distribution with Frequency Encoding
… demonstration of high-dimensional quantum key distribtuion (QKD) protocol with frequency-bin encoding using time-energy entangled photon pairs. We used programmable frequency filters to obtain 16 frequency bins for key generation within a 640 GHz flat spectrum in the telecommunication …
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Quantum key distribution beyond the repeaterless secret key capacity
… a theoretical limit known as repeaterless secret key capacity. Overcoming this limit with today’s technology was believed to be impossible until the recent proposal of Twin-field (TF) quantum key distribution (QKD), a scheme that uses phase-coherent optical signals and an auxiliary measuring …
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Quantum key distribution protocols with high rates and low costs
… has been paid great attention recently. Quantum key distribution is a hot research topic for physical layer security in the two decades. This thesis focuses on two quantum key distribution protocols that can potentially increase the key generation rate and lower the cost. On protocol is based on …
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Cryptographic Key Distribution In Wireless Sensor Networks Using Bilinear Pairings
… space. Despite many research efforts, key distribution in WSNs still remains an open problem. Many of the proposed schemes suffer from high communication overhead and storage costs, low scalability and poor resilience against different types of attacks. The exclusive usage of simple and …
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Cryptographic key distribution in wireless sensor networks: a hardware perspective
… suitability of different methods of symmetric key distribution for application in wireless sensor networks are discussed. Each method is considered in terms of its security implications for the network. It is concluded that an asymmetric scheme is the optimum choice for key distribution. In …
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Improving Routing Security Using a Decentralized Public Key Distribution Algorithm
Today's society has developed a reliance on networking infrastructures. Health, financial, and many other institutions deploy mission critical and even life critical applications on local networks and the global Internet. The security of this infrastructure has been called into question over the …
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Protocols and Resources for New Generation Continuous Variable Quantum Key Distribution
… so far has come from the development of quantum key distribution (QKD). The majority of the development of QKD is done with discrete variables (DV), i.e. qubits with the underlying system of single photons. This is one interpretation of an optical field. Alternatively an optical field can be …
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Protocols and Resources for New Generation Continuous Variable Quantum Key Distribution
… so far has come from the development of quantum key distribution (QKD). The majority of the development of QKD is done with discrete variables (DV), i.e. qubits with the underlying system of single photons. This is one interpretation of an optical field. Alternatively an optical field can be …
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Design of New-generation Quantum Key Distribution Systems for Secure Communication
… processing tasks. Among them, the quantum key distribu- tion (QKD) technique guarantees the information-theoretic security of the task of remote secure key distribution. Unlike its classical counterpart, the security of QKD does not rely on the lack of computational power of the current …
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The Security of Self-Differencing Avalanche Photodiodes for Quantum Key Distribution
Quantum key distribution (QKD) allows two users to communicate with information theoretic security by encoding information on single photons. This security is based on the laws of physics and as such can never be broken in theory. However, in practice, components do not always behave according to …
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Practical Continuous Variable Quantum Key Distribution System with ‘Local’ Local Oscillator
Quantum key distribution (QKD) has been proven to promise unconditionally secure data communication between remote legitimate users，based on the fundamental laws of quantum mechanics. QKD has great potential to be commercialized in the market and implemented in securing critical institutions, such …
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DESIGN OF AN OPTICAL GROUND STATION FOR SPACE-BASED QUANTUM KEY DISTRIBUTION
Quantum key distribution (QKD) provides information-theoretic security built on the ‘No Cloning’ Theorem and recent efforts have demonstrated that space-based QKD may be established with acceptable link loss. Meanwhile, on the ground, a network of optical ground station (OGS) is necessary to …
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DEPLOYED QUANTUM KEY DISTRIBUTION WITH A ROOM-TEMPERATURE TELECOM SINGLE PHOTON SOURCE
Quantum key distribution (QKD) allows distant users to communicate with perfect secrecy based on the principles of quantum physics. Practical QKD in deployed fibers serves as an important part of the future quantum networks. Although Weak Coherent Pulses have achieved impressive key rates as QKD …
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