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Forensic Analysis of Cryptocurrency Mining Servers
Kelečéni, Jakub ; Grégr, Matěj (referee) ; Veselý, Vladimír (advisor)
This thesis focuses on the mining of cryptocurrency with emphasis on analysis of communication between miner and server. It describes basic principles of cryptocurrencies, mining and employed communication protocols. The next part of thesis is about design and implement modification of existing system (catalogue). This modification will add temporality to the catalog, what increase reliability of stored metadata. Description, functionality and purpose of existing system is included in the next text.
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User Interface of Decentralized National Elections
Malínek, Libor ; Malinka, Kamil (referee) ; Stančíková, Ivana (advisor)
The thesis describes the development of a decentralized application and user interface for the voting protocol in the Rust language. The main subject of work was to create an application that is easy to control by the user and at the same time meets the security elements according to the voting protocol. The result of the work is a decentralized application that meets the requirements of the voting protocol and its user interface, which was modified according to user feedback. From a theoretical point of view, the work deals with decentralized applications and the principle of their operation. The thesis also describes the Rust language and its web frameworks.
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Processing of the Blockchain Employing IPFS
Múčka, Matúš ; Lichtner, Ondrej (referee) ; Veselý, Vladimír (advisor)
Cieľom tejto práce je navrhnúť platformu na spracovanie a preskúmavanie blockchainu vybraných kryptomien pri použití IPFS. Na riešenie tohoto problému bolo potrobné navrhnúť vlastný decentralizovaný a distribuovaný databázový systém, ktorý podporuje pokročilé dotazy. Vytvorené riešenie poskytuje prehľadné grafické užívateľské rozhranie, ktoré slúži na vizualizáciu dát a taktiež API, vďaka ktorému sa dá systém jednoducho napojiť na iné aplikácie. Prínosom tejto práce je nový pohľad na zpracovávanie blockchainu čo otvára nové možnosti v~jeho prehľadávaní.
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Decentralized Biometric Autentication System
Jacko, Martin ; Malinka, Kamil (referee) ; Januš, Filip (advisor)
The goal of this thesis is to design and implement biometric authentication system, which allows for biometric data storage integrity violation detection. This thesis also includes theoretical section, where centralized and decentralized authentication systems, along with blockchain technology, are examined. The rest of the thesis is looking into implementation and testing methodology description, and evaluation of designed system. Finalized system uses blockchain to store cryptographic hash of data that is uploaded to database. During authentication phase, stored hash is used to verify integrity of biometric data storage.
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Security and Privacy Oriented-Survey of Financial Applications Utilizing Blockchain
Křížová, Hana ; Malinka, Kamil (referee) ; Homoliak, Ivan (advisor)
Tato bakalářská práce se soustřeďuje na finanční aplikace vystavěné na blockchainu, kterým se také říká decentralizované finance (DeFi). Blockchain pro oblast finančnictví představuje zásadní technologii měnící dosavadní nastavení systému. V této práci jsou představeny reálné, ale také potencionální blockchainové aplikace z oblasti finančnictví a bankovnictví. Jsou ukázány jejich rozdíly a přínosy oproti dosavadním aplikacím, které jsou řízeny centrálním způsobem. Tato bakalářská práce se především soustřeďuje na identifikaci bezpečnostních hrozeb plynoucí z přechodu na blockchain a navrhuje jejich potencionální řešení.
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Simulator for Verifying the Properties of DAG-Based Consensus Protocols
Hladký, Tomáš ; Tamaškovič, Marek (referee) ; Malinka, Kamil (advisor)
V posledných rokoch sa vo výskumnej komunite venuje blockchainu významná pozornosť. Odvtedy bolo navrhnutých niekoľko návrhov na riešenie problému priepustnosti blockchainov založených na Proof-of-Work. V tejto práci študujeme existujúce návrhy blockchainu s acyklicky orientovaným grafom (DAG), ktoré navrhujú riešenie spomínaného problému, najmä protokol PHANTOM (a jeho optiamlizácia GHOSTDAG). Využívajú bitcoinový protokol a navrhujú náhodný výber transakcií, čo vedie k zvýšeniu priepustnosti transakcií. Simuláciou sa však dokázalo, že aktéri, ktorí využívajú stratégiu náhodného výberu transakcií, majú menší zisk ako aktéri, ktorí nedodržiavajú protokol a vyberajú transakcie racionálne (t.j. najziskovejšie). Tento dôkaz bol vykonaný na malej sieti desiatich uzlov s kruhovou topológiou. Cieľom tohto článku je rozšíriť, optimalizovať a automatizovať existujúci simulátor blockchainu. Implementujeme sieťovú topológiu podobnú bitcoinu s realistickou latenciou šírenia blokov. Okrem toho optimalizujeme simulátor tak, aby sme mohli spúšťať viac simulácií paralelne a rýchlejšie, vrátane automatizačných nástrojov, ktoré môžu upravovať vstupné konfigurácie, vykonávať kombináciu simulácii na viacerých jadrách CPU na základe vstupných parametrov a analyzovať zisky a kolízie transakcií. Nakoniec vykonáme experimenty na overenie výhod škodlivých aktérov v sieti podobnej Bitcoinu a vytvoríme výplatnú funkciu na potrestanie tohto správania.
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Identification of Cryptocurrency Users
Zrnčík, Henrich ; Matoušek, Petr (referee) ; Veselý, Vladimír (advisor)
abstract.en={The 3rd January 2009 is considered to be the beginning of the cryptocurrency era. This work will deal with one of the ways of obtaining information about cryptocurrency users. It will be done by retrieving it from public websites where users often knowingly or unknowingly publish their cryptocurrency's address for different purposes (donation accounts or online payments which include personal data) as a result of which it is possible to link their crypto account with their real identity. The information is obtained through web scrappings. The result is an implemented application capable of automated collecting of data about the identity of cryptocurrency users and its subsequent storage in a structured database.
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Activity Alarm for Cryptocurrency Blockchains
Vokráčko, Lukáš ; Grégr, Matěj (referee) ; Veselý, Vladimír (advisor)
Cryptocurrencies are becoming popular and the demand for monitoring transactions inside them increases alongside with it. In this thesis, I describe few of the most widespread cryptocurrencies built on top of a blockchain and how to obtain information of their transactions in order to raise alarms. I discuss existing solutions and describe application Cryptoalarm designed for monitoring transactions involving specific addresses in order to raise alarms. Cryptoalarm scans blockchains of cryptocurrencies such as Bitcoin, Bitcoin Cash, Litecoin, Zcash, Dash, Ethereum and raises alarms about address activities in real-time.
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Secure Implementation of Blockchain Technology
Kovář, Adam ; Fujdiak, Radek (referee) ; Malina, Lukáš (advisor)
This thesis describes basis of blockchain technology implementation for SAP Cloud platform with emphasis to security and safety of critical data which are stored in blockchain. This diploma thesis implements letter of credit to see and control business process administration. It also compares all the possible technology modification. Thesis describes all elementary parts of software which are necessary to implement while storing data and secure integrity. This thesis also leverages ideal configuration of each programable block in implementation. Alternative configurations of possible solutions are described with pros and cons as well. Another part of diploma thesis is actual working implementation as a proof of concept to cover letter of credit. All parts of code are design to be stand alone to provide working concept for possible implementation and can source as a help to write productive code. User using this concept will be able to see whole process and create new statutes for whole letter of credit business process.
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