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Dissertations / Theses on the topic 'Blockchain and cryptography'

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1

Duong, Tuyet. "BLOCKCHAIN SCALABILITY AND SECURITY." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5559.

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Cryptocurrencies like Bitcoin have proven to be a phenomenal success. The underlying techniques hold huge promise to change the future of financial transactions, and eventually the way people and companies compute, collaborate, and interact. At the same time, the current Bitcoin-like proof-of-work based blockchain systems are facing many challenges. In more detail, a huge amount of energy/electricity is needed for maintaining the Bitcoin blockchain. In addition, their security holds if the majority of the computing power is under the control of honest players. However, this assumption has been
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2

Palm, Emanuel. "Implications and Impact of Blockchain Transaction Pruning." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-64986.

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This thesis presents an extension to Hyperledger Fabric, a private blockchain system, allowing historic transactions to be pruned without peer coordination. The feature is facilitated via pruning predicate functions, provided along any smart contracts a given system is desired to host. An evaluation of the extension demonstrates its impact, in terms of memory saved, for a specific asset delivery use case. It is concluded that the gains of pruning historic transactions from blockchain systems could yield significantly reduced storage requirements for some categories of applications, especially
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3

Pérez, Kempner Octavio. "Malleable cryptography : advances and applications to privacy-enhancing technologies." Electronic Thesis or Diss., Université Paris sciences et lettres, 2022. http://www.theses.fr/2022UPSLE056.

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Cette thèse étudie la malléabilité dans le contexte du chiffrement à clé publique et des signatures numériques, en présentant les avancées et les applications des technologies améliorant la confidentialité. La première partie aborde le problème de l'égalité générique des textes en clair et les preuves d'inégalité. Étant donné deux textes chiffrés générés par un schéma de chiffrement à clé publique, le problème de l'égalité des textes chiffrés consiste à déterminer si les textes chiffrés contiennent la même valeur. Parallèlement, le problème de l'inégalité du texte clair consiste à déterminer s
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4

Dalmasso, Loïc. "De la vulnérabilité des nœuds capteurs à la certification des transactions sur le réseau, une approche de la sécurisation de l’Internet des Objets." Thesis, Montpellier, 2020. http://www.theses.fr/2020MONTS069.

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L’Internet des Objets (IdO) est une infrastructure mondiale, visant à connecter une multitude de systèmes de diverses natures, dans le but de générer de nouveaux services. Alors que cette hyperconnectivité laisse entrevoir de nombreuses perspectives dans tous les secteurs d’activité (e.g. la santé, l’industrie, l’énergie etc.), son déploiement constitue un défi majeur en termes de sécurité et de vie privée. L’usage de la cryptographie devient alors primordial, notamment pour assurer la confidentialité des données. Néanmoins, les algorithmes classiques tels que l’AES ne sont pas conçus pour êtr
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5

Alzahrani, Naif Saeed. "A Secure Anti-Counterfeiting System using Near Field Communication, Public Key Cryptography, Blockchain, and Bayesian Games." PDXScholar, 2019. https://pdxscholar.library.pdx.edu/open_access_etds/5038.

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Counterfeit products, especially in the pharmaceutical sector, have plagued the international community for decades. To combat this problem, many anti-counterfeiting approaches have been proposed. They use either Radio Frequency Identification (RFID) or Near Field Communication (NFC) physical tags affixed to the products. Current anti-counterfeiting approaches detect two counterfeiting attacks: (1) modifications to a product's tag details, such as changing the expiration date; and (2) cloning of a genuine product's details to reuse on counterfeit products. In addition, these anti-counterfeitin
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6

OLIVEIRA, FILHO Márcio Barbosa de. "Utilizando o protocolo Bitcoin para condução de computações multilaterais seguras e justas." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/17143.

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Submitted by Irene Nascimento (irene.kessia@ufpe.br) on 2016-06-22T17:04:20Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Utilizando o Protocolo Bitcoin para Condução de Computações Multilaterais Seguras e Justas.pdf: 1665447 bytes, checksum: 2ff437be55e080c80d97e0d6582cb360 (MD5)<br>Made available in DSpace on 2016-06-22T17:04:20Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Utilizando o Protocolo Bitcoin para Condução de Computações Multilaterais Seguras e Justas.pdf: 1665447 bytes
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7

Pérez, Garcia Julio César. "Contribution to security and privacy in the Blockchain-based Internet of Things : Robustness, Reliability, and Scalability." Electronic Thesis or Diss., Avignon, 2023. http://www.theses.fr/2023AVIG0120.

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L’Internet des Objets (IoT, Internet of Things) est un réseau diversifié d’objets interconnectés, généralement via l’internet. En raison de la sensibilité des informations échangées dans les applications de IoT, il est essentiel de garantir la sécurité et le respect de la vie privée. Ce problème est aggravé par la nature ouverte des communications sans fil et par les contraintes de puissance et de ressources computationnelles de la plupart des appareils IoT. Parallèlement, les solutions de sécurité IoT existantes sont basées sur des architectures centralisées, ce qui pose des problèmes d’évolu
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8

Piccolo, Alessandro. "Distributed ledger technology in the capital market : Shared versus private information in a permissioned blockchain." Thesis, Uppsala universitet, Avdelningen för datalogi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-326341.

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This master thesis explores how blockchain technologies can be utilized within the financial sector with focus on how to store both private and public information on the blockchain. The capital market is looking into ways of cutting down administrative work through streamlining the financial process by using blockchain technologies. Public key encryption together with hash functions and a consensus mechanism make up the basis for creating a shared trustless database system. The thesis was conducted by extensive research concerning cryptographic topics, and a literature study was made to compar
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9

Carr, Christopher Alan. "Towards fairness and decentralisation in modern cryptocurrencies." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/130876/1/Christopher%20Alan_Carr_Thesis.pdf.

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The thesis examines and improves upon the properties of both fairness and decentralisation in modern cryptocurrencies, re-examining public key infrastructure, client puzzles and useful proofs of work in the blockchain context. The thesis also develops a framework construction for a novel directed-acyclic-graph-based cryptocurrency scheme. This framework represents a major result, being both the first academic and practically realisable proposal for using directed acyclic graphs in decentralised cryptocurrencies.
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10

Караван, В. Р., та Ю. В. Баришев. "Захист приватних повідомлень на основі технології блокчейн та псевдонедетермінованого шифрування". Thesis, ВНТУ, 2019. http://ir.lib.vntu.edu.ua//handle/123456789/24231.

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Проаналізовано відомі систем обміну повідомленнями та спроектовано структуру власної системи захисту обміну повідомленнями на основі технології смарт-контрактів із застосуванням методу псевдонеде-термінованого шифрування. Смарт-контракт розгорнуто у блокчейні Ethereum.<br>The analysis of known messaging systems was performed and designed the structure of own secure messaging system based on smart-contract technology using the pseudonondeterministic ciphering method. Smart contract is deployed in the Ethereum blockchain.
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11

Kandi, Mohamed Ali. "Lightweight key management solutions for heterogeneous IoT." Thesis, Compiègne, 2020. http://www.theses.fr/2020COMP2575.

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L'Internet des objets (IdO) est une technologie émergente ayant le potentiel d'améliorer notre quotidien de différentes façons. Elle consiste à étendre la connectivité au-delà des appareils standards (tels que les ordinateurs, les tablettes et les smartphones) à tous les objets du quotidien. Ces appareils, également appelés objets intelligents, peuvent alors collecter des données de leur entourage, collaborer pour les traiter puis agir sur leur environnement. Cela augmente leurs fonctionnalités et leur permet d'offrir divers services au profit de la société. Cela dit, de nombreux défis ralenti
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12

Коротка, Г. М. "Система захисту розумного будинку на основі блокчейн технологій". Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/24852.

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Коротка, Г. М. Система захисту розумного будинку на основі блокчейн технологій : випускна кваліфікаційна робота : 125 "Кібербезпека" / Г. М. Коротка ; керівник роботи М. Є. Шелест ; НУ "Чернігівська політехніка", кафедра кібербезпеки та математичного моделювання . – Чернігів, 2021. – 50 с.<br>Мета роботи: розробка системи захисту розумного будинку на основі блокчейн технологій. Об’єкт дослідження: процес забезпечення інформаційної безпеки в роботі розумних пристроїв. Предмет дослідження: система захисту розумного будинку на основі блокчейн технології. Методи дослідження: для вирішення поста
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13

Tigerström, Viktor. "Micropayments through cryptocurrency mining." Thesis, Uppsala universitet, Institutionen för informatik och media, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-303357.

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The monetary policies of states and systems built upon them do not naturally allow transactions of a very small value, as the transaction costs exceeds the actual value of the transaction. These types of transactions are called micropayments. This is problematic as it removes the possibility to monetize content that has a valuation that is so low that the costs of the transaction exceeds the value of the content. In this thesis we aim to create a system that allows micropayments to monetize low value content. We do so by developing a design theory based on Gregor and Jones conceptual model for
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14

Toulemonde, Ambre. "Study of consensus protocols for blockchain technologies and quantum cryptanalysis of Misty schemes." Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPASG041.

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Ces dernières années, deux domaines de recherche en cryptologie ont reçu une attention considérable : les protocoles de consensus pour les technologies blockchain dus à l'émergence des cryptomonnaies, et la cryptanalyse quantique due à la menace des ordinateurs quantiques. Naturellement, nos sujets de recherche se sont orientés vers ces deux domaines que nous avons étudiés séparément dans cette thèse.Dans la première partie, nous analysons la sécurité de certains protocoles de consensus pour les technologies blockchain qui sont un des principaux défis dans ces technologies. En particulier, nou
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15

Longo, Riccardo. "Formal Proofs of Security for Privacy-Preserving Blockchains and other Cryptographic Protocols." Doctoral thesis, Università degli studi di Trento, 2018. https://hdl.handle.net/11572/368971.

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Cryptography is used to protect data and communications. The basic tools are cryptographic primitives, whose security and efficiency are widely studied. But in real-life applications these primitives are not used individually, but combined inside complex protocols. The aim of this thesis is to analyse various cryptographic protocols and assess their security in a formal way. In chapter 1 the concept of formal proofs of security is introduced and the main categorisation of attack scenarios and types of adversary are presented, and the protocols analysed in the thesis are briefly introduced with
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16

Longo, Riccardo. "Formal Proofs of Security for Privacy-Preserving Blockchains and other Cryptographic Protocols." Doctoral thesis, University of Trento, 2018. http://eprints-phd.biblio.unitn.it/2812/1/main-thesis.pdf.

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Cryptography is used to protect data and communications. The basic tools are cryptographic primitives, whose security and efficiency are widely studied. But in real-life applications these primitives are not used individually, but combined inside complex protocols. The aim of this thesis is to analyse various cryptographic protocols and assess their security in a formal way. In chapter 1 the concept of formal proofs of security is introduced and the main categorisation of attack scenarios and types of adversary are presented, and the protocols analysed in the thesis are briefly introduced
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17

Kouicem, Djamel Eddine. "Sécurité de l’Internet des objets pour les systèmes de systèmes." Thesis, Compiègne, 2019. http://www.theses.fr/2019COMP2518.

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L'internet des objets (IoT) est une nouvelle technologie qui vise à connecter des milliards d'objets physiques à Internet. Ces objets peuvent être engagés dans des relations complexes, notamment la composition et la collaboration avec d'autres systèmes indépendants et hétérogènes, afin de fournir de nouvelles fonctionnalités, conduisant ainsi à ce que l'on appelle les systèmes de systèmes (SoS). Les composants de l'IoT communiquent et collaborent dans des environnements distribués et dynamiques, confrontés à plusieurs problèmes de sécurité de grande ampleur. La sécurité es tconsidérée parmi le
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18

Fontes, Rebello Gabriel Antonio. "Payment Channel Networks with Resource-constrained Devices." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS254.

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Les réseaux de canaux de paiement (Payment Channel Networks - PCN) représentent la principale solution pour mettre les paiements basés sur la blockchain à l'échelle des systèmes de paiement centralisés. Cependant, les PCN actuels nécessitent que les nœuds restent en ligne en permanence et disposent de suffisamment de ressources pour exécuter les mécanismes de sécurité des paiements. De telles hypothèses sont difficiles à garantir dans des appareils alimentés par batterie avec des modèles de connectivité intermittente, tels que les téléphones mobiles, les objets connectés et les capteurs. Dans
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19

Leung, Philip, and Daniel Svensson. "SecuRES: Secure Resource Sharing System : AN INVESTIGATION INTO USE OF PUBLIC LEDGER TECHNOLOGY TO CREATE DECENTRALIZED DIGITAL RESOURCE-SHARING SYSTEMS." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187348.

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The project aims at solving the problem of non-repudiation, integrity and confidentiality of data when digitally exchanging sensitive resources between parties that need to be able to trust each other without the need for a trusted third party. This is done in the framework of answering to what extent digital resources can be shared securely in a decentralized public ledger-based system compared to trust-based alternatives. A background of existing resource sharing solutions is explored which shows an abundance third party trust-based systems, but also an interest in public ledger solutions in
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20

Ghaffari, Fariba. "A novel blockchain-based architecture for mobile network operators : Beyond 5G." Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAS009.

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Alors que l'architecture centralisée et autonome existante des opérateurs de réseaux mobiles (ORM) fournit une connectivité à des milliards d'utilisateurs, ils souffrent d'un manque de mécanismes techniques pour améliorer la collaboration entre les MNO et les autres fournisseurs.Cela a des impacts sur les coûts de mutualisation, ainsi que sur la consommation d'énergie et l'impact environnemental. Cela peut également empêcher l'avènement de modèles commerciaux plus collaboratifs avec d'autres fournisseurs ou même avec des clients. De plus, la complexité des réseaux au-delà de la 5G peut dépasse
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21

Borysenko, Yuliia. "Problems and prospects of practical application of smart - contract technolog." Thesis, National Aviation University, 2021. https://er.nau.edu.ua/handle/NAU/53746.

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1. Insurance in the digital economy: problems and prospects. - [Electronic scientific professional publication]. - J .: MSU, 2018. - № 1. - Access mode: https://cutt.ly/pc9QUZt 2. Practical cases of application of blockchain - technologies in insurance in 2020. - [Electronic resource]. - Access mode: https://forinsurer.com/news/20/12/01/38816 3. Why is a blockchain in insurance a chance for an entrepreneur? - [Electronic edition]. - Access mode: https://cutt.ly/7c9QSAx 4. Blockchain (new) insurance. - [Electronic resource]. - Access mode: https://cutt.ly/Kc9QKpk 5. Internet ins
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22

Henry, Tiphaine. "Towards trustworthy, flexible, and privacy-preserving peer-to-peer business process management systems." Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. http://www.theses.fr/2022IPPAS024.

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La technologie blockchain peut être utilisée comme outil de désintermédiation fiable pour la gestion des processus métiers inter-organisationnels. Elle assure la traçabilité de l'exécution des activités et du flux de contrôle. Cependant, assurer la confiance dans le protocole de déploiement et d'exécution, permettre la flexibilité des processus et respecter la confidentialité des données restent trois verrous à solutionner dans cet environnement.Pour résoudre les problématiques susmentionnées , nous présentons les contributions suivantes.D'abord, nous présentons un mécanisme de déploiement et
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23

Solat, Siamak. "Novel fault-tolerant, self-configurable, scalable, secure, decentralized, and high-performance distributed database replication architecture using innovative sharding to enable the use of BFT consensus mechanisms in very large-scale networks." Electronic Thesis or Diss., Université Paris Cité, 2023. http://www.theses.fr/2023UNIP7025.

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Cette thèse de doctorat se compose de 6 chapitres. Dans le premier chapitre, en guise d'introduction, nous donnons un aperçu des objectifs généraux et des motivations des réseaux décentralisés et permissionless, ainsi que des obstacles auxquels ils sont confrontés. Dans l'introduction, nous évoquons également la solution irrationnelle et illogique, connue sous le nom de « blockchain permissioned », qui a été proposée pour améliorer les performances des réseaux similaires à Bitcoin. Cette question a été détaillée au chapitre 5. Dans le chapitre 2, nous rendons clairs et intelligibles les systèm
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24

(11191410), Duc Viet Le. "Efficient Cryptographic Constructions For Resource-Constrained Blockchain Clients." Thesis, 2021.

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<div><div>The blockchain offers a decentralized way to provide security guarantees for financial transactions. However, this ability comes with the cost of storing a large (distributed) blockchain state and introducing additional computation and communication overhead to all participants. All these drawbacks raise a challenging scalability problem, especially for resource-constrained blockchain clients. On the other hand, some scaling solutions typically require resource-constrained clients to rely on other nodes with higher computational and storage capabilities. However, such scaling solutio
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Costa, Diogo Filipe Duarte. "Proposal of a traceability 4.0 system in Renault CACIA using blockchain technologies." Master's thesis, 2020. http://hdl.handle.net/10773/31446.

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Increasing popularity of cryptocurrencies lead to the rapid development of blockchain-based distributed ledger keeping systems. Industrial applications for the new technologies were soon found, enhanced by needs of security, trust and transparency along the value-chain in traceability of products, parts and processes, particularly when transactions are being maintained through several different entities. Traceability solutions are also increasingly being built upon IoT or IIoT platforms. Although this allows for highly modular and flexible architectures, severe security deficiencies make
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Parkin, Jack. "Money/code/space : Bitcoin, blockchain, and geographies of algorithmic decentralisation." Thesis, 2018. http://hdl.handle.net/1959.7/uws:48761.

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Newly emerging cryptocurrencies and blockchain technology provide a challenging research problem for human geographers. Bitcoin, the first widely implemented cryptocurrency and example of a blockchain architecture, seemingly separates itself from the existing territorial boundedness of nation state currencies via a digital process of algorithmic decentralisation. Proponents declare that utilisation of cryptography to advance blockchain transactions will disrupt the modern centralised structures by which capitalist economies are currently organised: corporations, commercial banks, and central b
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Bouidani, Maher M. "Design and implementation of a blockchain shipping application." Thesis, 2019. https://dspace.library.uvic.ca//handle/1828/10568.

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The emerging Blockchain technology has the potential to shift the traditional centralized systems to become more flexible, efficient and decentralized. An important area to apply this capability is supply chain. Supply chain visibility and transparency has become an important aspect of a successful supply chain platform as it becomes more complex than ever before. The complexity comes from the number of participants involved and the intricate roles and relations among them. This puts more pressure on the system and the customers in terms of system availability and tamper-resistant data. This t
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Lobato, João Paulo Serafim. "A blockchain-based information security solution for a distributed multi-cloud system." Master's thesis, 2018. http://hdl.handle.net/10071/19440.

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Com o aumento dos dados gerados a nível mundial impulsionado pelo rápido crescimento da Internet das coisas e dos aparelhos conectados, torna-se de extrema importância guardar e manter guardado, fora do alcance de pessoas indesejadas, tudo o que nos diz respeito e/ou que nos possa comprometer, mesmo que de forma inadvertida. Nesta senda da segurança da informação e proteção de dados numa era da Internet das coisas cada vez mais conectada, surgiu a oportunidade de desenvolver, embora que apenas conceptualmente, uma solução que pretende atender aos requisitos cada vez mais exigentes das pessoas
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FRIOLO, DANIELE. "New perspectives in multi-party computation: low round complexity from new assumptions, financial fairness and public verifiability." Doctoral thesis, 2021. http://hdl.handle.net/11573/1566920.

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Research in Multi-Party Computation is constantly evolving over the years. Starting from the very first result by Yao in 1982, to serve new and more practical scenarios, a lot of different protocols with stronger security properties have been introduced and proven for several assumptions. For some functionalities, properties like public verifiability, fairness and round-optimality can be considered nowadays a minimal set of assumption to consider an MPC protocol practical. Asynchrony, in the sense that different parties should be able to join a protocol at different times, is fundamental f
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DRDÁK, František. "Rozbor a návrh aplikace pro digitální měnu Bitcoin." Master's thesis, 2015. http://www.nusl.cz/ntk/nusl-188109.

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The thesis is focused on the topic of virtual cryptocurrency Bitcoin. The theoretical part is divided into several chapters. First of all, there is a chapter containing basic information about the currency's history, its development to the present, as well as principles of operation of this currency. Because it is a currency based on cryptographic principles next chapter summarizing cryptographic techniques, which is necessary to know for subsequent analysis of this currency. In other parts is elaborated a detailed analysis of the principles of Bitcoin. The main point of this analysis is a sys
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