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 29 for “"Proof-of-Work"”.
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Security for proof of work blockchains via checkpointing
Finality gadgets are comprised of a Byzantine Fault Tolerant (BFT) protocol finalizing blocks produced by a Proof-of-Work (PoW) or Proof-of-Stake (PoS) chain protocol. They have become very popular methods for combining the best features of the BFT and PoW protocols and are proposed for deployment …
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Proof-of-Work Mitigation Strategy for DNS-Based Amplification Attacks
Distributed Denial of Service attacks, and particularly DNS Amplification attacks, have seen a steady rise in deployment over the past few decades. DNS Amplification attacks, in particular, are challenging to identify and mitigate because of their apparent similarity to legitimate DNS traffic. This …
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Improved blockchain - Proof-of-work consensus protocol - performance using machine learning
… It is a new paradigm that helps in the existence of cryptocurrency and eliminates the third party in a financial transaction. It has the potential to optimise, enhance and streamline many processes outside the cryptocurrency and financial sector but the adoption of the technology is limited by the …
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Proof-of-Work Based Mitigation of Real Time Video DDoS Attacks
… grow in size and complexity, Distributed Denial of Service (DDoS) attacks grow in size and complexity alongside it. One particularly common form of DDoS attack is the TCP SYN flood, which exploits the TCP handshake process to exhaust server resources. This thesis investigates the use of a novel …
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Design and development of a parallel Proof of Work for permissionless blockchain systems
… a decentralized consensus in a peer-to-peer network. A large number of the current cryptocurrencies use blockchain technology to maintain the network and the peers use a consensus mechanism called Proof of Work to verify and confirm the transactions. However, the transaction speed in this …
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Reinforcement Learning assisted Adaptive difficulty of Proof of Work (PoW) in Blockchain-enabled Federated Learning
This work addresses the challenge of heterogeneity in blockchain mining, particularly in the context of consortium and private blockchains. The motivation stems from ensuring fairness and efficiency in blockchain technology's Proof of Work (PoW) consensus mechanism. Existing consensus algorithms, …
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ThermoEquil: a secure protocol for committee-based permissionless blockchains
Proof of work, as a widely accepted method, is limited by its low throughput. A significant approach toovercoming the performance and scalability limitations is to make hybrid blockchains by combining proofof work with other decentralized systems. The committee-based protocol is proposed to split …
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Efficient and egalitarian consensus
… currency Bitcoin has popularized a new line of research on consensus in a permissionless environment, where participants may join or leave at any time and need not know how many other participants exist or who they are. Bitcoin's solution, now known as the Nakamoto consensus, is to build a …
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Blockchain Security: Double-Spending Attack and Prevention
… that distributed consensus systems based on proof of work are vulnerable to hashrate-based double-spending attacks due to abuse of majority rule. Through building a private fork of Litecoin and executing a double-spending attack this thesis examines the mechanics and principles behind the …
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Softwar: A Novel Theory on Power Projection and the National Strategic Significance of Bitcoin
Current analysis of Bitcoin’s underlying proof-of-work technology is almost exclusively based on financial, monetary, or economic theory. Recycling the same theoretical frameworks when performing hypothesis-deductive analysis of Bitcoin has the potential to create systemic-level analytical bias …
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Bitcoin Protocol Analysis: Game Theory and Protocol Integrity
This thesis develops a unified mathematical framework for analysing the economic dynamics of proof-of-work mining in scalable digital cash systems. The central contribution is the construction of an unbounded-horizon stochastic game that embeds the full mechanical structure of …
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PowMail : want to fork? : do some work
… and implement PowMail, a secure email framework that uses proof-of-work to prevent impersonation attacks. PowMail uses a novel authenticated data structure called a Po W-tree to enable email users to jointly certify the history of all users' public keys. An implementation is given in the Go …
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Cryptographic Innovations in Blockchain
… well-known paper that gave birth to Bitcoin. One of the reasons blockchains are attractive is the use of cryptography, which is utilised in particular to ensure scalability, privacy and security. Despite their success, blockchains are still relatively young, which is why new protocols are …
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An email spam filtering proxy using secure authentication and micro-bonds
… designed and implemented as a novel combination of existing technologies in order to give an email user full control over their incoming email. The innate uncertainty of automatic spam detection creates a tension between the desire to filter 100% of spam, and the need to avoid the loss of …
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Fine-grained cryptography
Fine-grained cryptography is the study of cryptographic objects that are required to be secure only against adversaries that are moderately more powerful than the honest parties. This weakening in security requirements opens up possibilities for meaningful cryptographic constructions in various …
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An alternative paradigm to analyze proof-of-stake protocols
… in DSpace on 2021-09-17T01:13:30Z (GMT). No. of bitstreams: 2 TRAN-THESIS-2021.pdf: 727856 bytes, checksum: 592dab0344d2e18481922ac0f004b0e0 (MD5) LICENSE.txt: 4206 bytes, checksum: 7fa3df11382bb4db5245ed7b0d39bbd2 (MD5) Previous issue date: 2021-04-27
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Understanding scalability in distributed ledger technology
… is required to demonstrate the true value of DLT. This dissertation first analyses scalability in ethereum and EOS. Currently, ethereum 1.0 uses proof of work (PoW) and handles only 14 transactions per second (tps) compared to Visa's peak 47 000 tps. Ethereum 2.0, known as Serenity, …
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Essays on Incentive Designs to Improve Market Performance
This dissertation is composed of three chapters. Each essay describes and models the structure of a market; identifies an inefficiency in outcomes and proposes an incentive scheme to reduce the inefficiency. First Chapter: Coordination Problems, Leverage Constraints and Smart Contract Solutions for …
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Automatic Population of Structured Knowledge Bases via Natural Language Processing
The Web has evolved into a huge mine of knowledge carved in different forms, the predominant one still being the free-text document. This motivates the need for Intelligent Web-reading Agents: hypothetically, they would skim through disparate Web sources corpora and generate meaningful structured …
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Assessing Blockchain’s Potential to Ensure Data Integrity and Security for AI and Machine Learning Applications
<p>The increasing use of data-centric approaches in the fields of Machine Learning and Artificial Intelligence (ML/AI) has raised substantial issues over the security, integrity, and trustworthiness of data. In response to this challenge, Blockchain technology offered a promising and practical …
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