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An Empirical Evaluation of Selfish Mining Strategies on Various Blockchains
Kubík, Ján Jakub
;
Košťál,, Kristián
(referee) ;
Homoliak, Ivan
(advisor)
Táto práca si kladie za cieľ posilniť bezpečnosť blockchainu tým, že prehĺbi pochopenie útokov typu sobecké ťaženie v rámci rôznych konsenzuálnych protokolov. Predchádzajúce výskumy sa sústredili na jednotlivé protokoly s jedným útočníkom. Štúdie s viacerými útočníkmi boli len pre konsenzuálny protokol Nakamoto. Na preklenutie tejto medzery bol vytvorený diskrétny, statický, stochastický simulačný framework na analýzu sobecnkého ťaženia s viacerými útočníkmi naprieč rôznymi protokolmi vrátane Nakamoto, Subchain a Strongchain. S použitím tohoto frameworku boli zreprodukované hranice pre úspešný útok na Nakamoto a Strongchain. Ďalej bola zistená hranica pre úspešný útok na Strongchain pre dvoch útočníkov. Pre Subchain bolo nezávisle skúmané sobecké ťaženie na slabých a silných blokoch. Bolo zistené, že len pre silné bloky je sobecké ťaženie ziskové s mierne vyššími hraniciami ako v Nakamoto. Hlavným prínosom tejto práce je vytvorený framework s overenými hranicami a vývojom sobeckého ťaženia pre podporované protokoly. Taktiež tento framework je ľahko rozšíriteľný o nové konsenzuálne protokoly, čo umožňuje hodnotiť odolnosť rôznych Proof of Work protokolov voči útokom typu sobecké ťaženie.
Detailed record
Analysis of the Move Programming Language for Blockchain Platforms
Šmehýl, Adam
;
Homoliak, Ivan
(referee) ;
Perešíni, Martin
(advisor)
Tato práce se zabývá zkoumáním programovacího jazyka Move z hlediska jeho použitelnosti pro vývoj aplikací (smart kontraktů či programů) na blockchainových platformách. Práce zahrnuje analýzu dvou klíčových aspektů. Prvním z nich je porovnání programovacích modelů platforem používajících jazyk Move s běžně používanými modely EVM-kompatibilních platforem (jako je Ethereum) a stále populárnějšího blockchainu Solana. Druhou částí práce je implementace stejného programu v Solidity na Ethereu, Rustu na Solaně a Move na Aptosu. Mezi kritéria pro porovnání těchto tří řešení patří transakční náklady, rychlost zpracování, čitelnost kódu a zkušenosti z vývoje. V rámci této práce byla provedena podrobná analýza unikátních vlastností jazyka Move, jako je správa zdrojů, používání generik a další zlepšení bezpečnosti při programování. Výsledky práce ukazují potenciál jazyka Move pro rozsáhlé použití v oblasti blockchainu, přičemž jeho silnou stránkou je bezpečnost (angl. secure coding), což přispívá k rostoucímu zájmu blockchainové komunity.
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