Browsar Examensarbeten för masterexamen // Master Theses efter Ämnesord "access control"
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- PostComparative Analysis of Blockchain Technologies for Data Ownership and Smart Contract Negotiation(2019) TAXIARCHIS, VAIOS; KASANDA, MALAMA; Chalmers tekniska högskola / Institutionen för data och informationsteknik; Seger, Carl-Johan; Schneider, GerardoBlockchain technologies have gained significant popularity in the recent past. They are distributed ledgers that record all the transactions on the network and allows parties who do not trust each other to transact. The parties collaborate in its maintenance. The Blockchain’s distributed nature connotes multiple ethical and privacy concerns, such as unauthorized access and control of decentralized applications. In this thesis, we first survey the state of the art, focusing on a comparative analysis of public and private implementations of distributed ledgers. Additionally, we present a proof of concept (PoC) implementation on the access control to certain parts of smart contracts as well as investigate the possibility of negotiating the terms of a smart contract. We make use of the commercial real estate leasing operations as a case study. We conduct a comprehensive evaluation of our PoC. This evaluation demonstrates a trade-off in the choice of blockchain technology for building distributed applications. Drawing from the process flow of paper based contract negotiations, we design a library mechanism that can be used to negotiate contract terms in a bilateral fashion.
- PostLanguage-based permissions in embedded systems(2020) Harryson, Magnus; Chalmers tekniska högskola / Institutionen för data och informationsteknik; Sabelfeld, Andrei; Russo, AlejandroEmbedded devices connected to the Internet are at risk of being targeted by malware attacks that may either use the vulnerable devices as part of a bot-net or as a source of sensitive data leaks. Securing embedded devices with access control could make devices less susceptible to attacks. This thesis investigates the usefulness and applicability of role based access control in an embedded system when using a query engine based on the logic programming languageDatalogonaFreeRTOS-platform. Ourﬁndingsshowthatimplementingaccess control into a preexisting codebase can be done eﬃciently but we recognize that the query engine needs to perform the evaluation faster to meet real-time requirements. We discuss possible causes to the slow evaluation and future improvements that could increase the performance.