|
|
An Empirical Evaluation of Selfish Mining Strategies on Various Blockchains
Kubík, Ján Jakub ; Košťál,, Kristián (oponent) ; Homoliak, Ivan (vedoucí práce)
The aim of this thesis is to enhance blockchain security by deepening the understanding of selfish mining attacks across various consensus protocols. Previous research was mainly focused on single protocols with one attacker, and limited studies have been conducted on multiple attackers in the Nakamoto consensus protocol. To address this gap, a discrete, static, stochastic simulation framework was developed to analyze selfish mining with multiple attackers in diverse consensus protocols, including Nakamoto, Subchain, and Strongchain. Through the use of this framework, the thresholds for successful selfish mining on Nakamoto were replicated, the Strongchain thresholds were verified, and a new threshold for two attackers in Strongchain was discovered. In the case of Subchain, independent, selfish mining on weak and strong blocks was investigated, revealing profitability in strong blocks with slightly higher thresholds than Nakamoto. The main contribution of this thesis lies in the development of a framework with verified thresholds and the exploration of selfish mining for the studied protocols, which can be easily extended for new consensus protocols, thereby enabling researchers to evaluate a protocol's resilience against selfish mining attacks.
|
|
|
Analysis of the Move Programming Language for Blockchain Platforms
Šmehýl, Adam ; Homoliak, Ivan (oponent) ; Perešíni, Martin (vedoucí práce)
This thesis studies the Move programming language, focusing on its usability for developing applications (smart contracts or programs) on blockchain platforms. Two key aspects are considered: first, a comparison of programming models using Move to widely used models of EVM-compatible platforms like Ethereum and the popular Solana blockchain; and second, the implementation of the same program in Solidity on Ethereum, Rust on Solana, and Move on Aptos. Criteria for comparison include deployment and execution costs, processing speed, code readability, and overall development experience. A detailed analysis of Move's unique features, such as resource management, the use of generics, and other security enhancements in programming, is conducted. The results demonstrate Move's potential for extensive use in the blockchain field, with its strong emphasis on secure coding and resource management contributing to the growing interest within the blockchain community.
|
host ::
RSS.