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Namecoin as authentication for public-key cryptography
Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
2014 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Namecoin som autentisering för asymmetrisk kryptering (Swedish)
Abstract [en]

Public-key cryptography is a subject that is very important to everyone who wants confidentiality and privacy in networks. It is important to understand how public-key cryptography systems work and what flaws they have. In the first part of this report we describe some of the most common encryption schemes and key agreements. We carefully investigate their flaws, if they are broken and what threats have dire consequences. We find that the biggest issue is authentication and we present current solutions to the problem. The current solutions are flawed because they rely too much on trusting different entities. It is only required that one trusted entity becomes malicious for the entire authentication system to be compromised. Because of this we propose an alternative system in the second part, Namecoin. A risk analysis in form of an attack tree is performed on the Namecoin system, where we describe how the attacks are executed and what you can do to prevent them. We present different threats against the system and we describe how dire the consequences are and the probability of their execution. Since Namecoin is an implementation of the block chain algorithm we have also explained how the block chain works in detail. We present why we think that Namecoin is a system that should replace the currently used certificate authority system. The certificate authority system is flawed because it is centralized and dependant on that no authority makes any mistakes. The Namecoin system does not become compromised unless more than 50 % of the hashrate in the system is used with malicious intent. We have concluded that the biggest threats against Namecoin have such a low probability that they can be neglected.

Place, publisher, year, edition, pages
2014. , 26 p.
Keyword [en]
Namecoin, block chain, public-key chryptography
National Category
Computer Engineering
URN: urn:nbn:se:liu:diva-108413ISRN: LIU-IDA/LITH-EX-G--14/067--SEOAI: diva2:730344
Subject / course
Computer and information science at the Institute of Technology
2014-06-03, Charles Babbage, Linköpings universitet, 581 83 Linköping, Linköping, 10:45 (Swedish)
Available from: 2014-07-02 Created: 2014-06-27 Last updated: 2014-11-28Bibliographically approved

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Namecoin as authentication for public-key cryptography(660 kB)209 downloads
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Type fulltextMimetype application/pdf

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