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Bitcoin
Herzán, Jiří ; Klíma, Tomáš (advisor) ; Veber, Jaromír (referee)
Bachelor's thesis is focused on crypto currency bitcoin. The thesis is divided into three parts. First chapter is focused on cryptography, which is used for bitcoin security. Next chapter describes basic bitcoin principles and bitcoin mining. In last chapter there are practically described two methods of bitcoin mining. The aim of this thesis is to bring coherent view on given themes, especially bitcoin mining. The main goal of this thesis is trying bitcoin mining using ASIC miner and Cloud mining method. The result is a statement about mining profitability.
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Galoisova tělesa
Horák, Martin
Horák, M. Galois fields. Brno: Mendel University, 2014. This bachelor thesis deals with creating the application for explaining how Galois fields work. It describes the principal of generating elements of the field and how mathematical operations between these elements work. It also deals with using of these fields for cryptography.
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Analysis and implementation of application for digital currency Bitcoin
DRDÁK, František
The thesis is focused on the topic of virtual cryptocurrency Bitcoin. The theoretical part is divided into several chapters. First of all, there is a chapter containing basic information about the currency's history, its development to the present, as well as principles of operation of this currency. Because it is a currency based on cryptographic principles next chapter summarizing cryptographic techniques, which is necessary to know for subsequent analysis of this currency. In other parts is elaborated a detailed analysis of the principles of Bitcoin. The main point of this analysis is a system of transactions, decentralized history, then joining the transactions into blocks and in the end creating blockchain. It also explains the principle of P2P networks. The practical part of this work focuses on the analysis and design of payment applications for mobile devices. There used open-source libraries such BitcoinJ. The application is developed in Java programming language with plugin for portable devices, which work under the operating system Android. For the purposes of analysis and design of graphical user interface is used UML diagrams. The specification of the UML diagrams was utilized by freely available graphics software and the result is also included in this work.
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Credit cards on the internet
Kolář, Jiří ; Matuštík, Ondřej (advisor) ; Kalina, Jaroslav (referee)
Using credit cards to buy goods and services is becoming more and more popular and this trend can be observed even when paying by card over the Internet. From a customer perspective is indeed a comfortable and quick way of paying. Merchants realize this and so in their online stores card payment allows. The content of this work illustrates the issue of security of payment cards on the Internet, encryption and secure communication, as a basis for describing 3D Secure standard. The aim is to analyze the security features of payment cards issued by banks and credit institutions operating on the Czech market from the perspective of the owner of the credit card. At the same time to estimate future developments in this sector based on facts and trends.
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Online Password Manager
Ort, Štěpán ; Buchalcevová, Alena (advisor) ; Mészáros, Jan (referee)
The objective of this thesis is to show on which principles a modern password manager works. The introductory theoretical part describes cryptographic algorithms and evaluates whether they are suitable for use in current applications. At the same time it presents methods how to create a password which is strong and also easily remembered. The second part explains the key characteristics of a password manager. The last chapter illustrates the architecture of online password storage and the way of communicating with the password manager. Measures that have to be taken in order to make such storage secure are also described here.
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.NET & Cryptology
PSÍK, Tomáš
The point of this work is to show how to solve certain cryptographic problems in Microsoft .Net Framework 3.5. The work is divided into three parts. The first is an overview of basic classes and methods which can be used to solve particular cryptographic tasks. This part shows how to use these classes and also is an overview of the most common cryptological terminology also used in this work. The second part shows how to use abstract classes prepared in the framework for implementing an application interface, which unifies usage of all cryptographic transformations under .net. The third part is about deciding on quality of certain implemented cryptographic algorithm. Implementing speed testing application for block ciphers and hash function and it also contains references of basic attacks. Implementations of speed testing program, two block ciphers (Rijndael and Skipjack), all in c#, are listed in Appendix.
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Comparison of the legislation of electronic signature in selected countries
Hautke, Tomáš ; Toman, Prokop (advisor) ; Svatá, Vlasta (referee)
Focus of this thesis is to compare legislation of electronic signature in the Czech Republic and in the USA. In first chapter are explained basic terms, such as cryptography, certificate or certification authority. Next two chapters deal with laws concerning electronic communication. In chapter about Czech legislation they are electronic signature law and electronic transactions and authorized document conversion law. Moreover, Czech Republic has to abide EU directive. Chapter about USA legislation consists of ESIGN act and UETA. Following chapter is dedicated to problems caused by imperfect legislation. Last chapter contains evaluation of described legislation.
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Latest trends in public-key cryptography
Tvaroh, Tomáš ; Ivánek, Jiří (advisor) ; Palovský, Radomír (referee)
The goal of this thesis is to describe principles of public-key cryptography, introduce and compare latest algorithms for asymmetric encryption and point out their advantages over the most popular cryptosystem - RSA. At the beginning, this thesis describes the evolution of public-key cryptography, its differences compared to symmetric-key cryptography and possibilities of using it for data encryption and digital signature. Mathematical background as well as principles of RSA are described afterwards. At the end, this thesis focuses on the latest algorithms on the basis of eliptic curves and their advantages over the most common algorithms are pointed out. The comparison is then summarized and a recommendation for the best cryptosystem is offered.
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Methods for maintaining state information in the HTTP protocol
Polsemov, Anton ; Pinkas, Otakar (advisor) ; Šváb, Ondřej (referee)
This bachelor thesis is focusing on HTTP protocol, its features, and technological aspects. The HTTP protocol is stateless so it is necessary to search for methods to keep status information. These methods are cookies, URL query, session id, http authentication, hidden fields in forms, IP address and additional. Every method has its own strong and weak features. Security of these methods influences a final resolution. Ahead of description of the methods, the thesis is concerning cryptography a describing HTTP cookies in detail. The practical section contains an analysis of online banking in Czech Republic and characterization of trends in this brand. Also, an installation of a PHP5, HTTP Apache server, creation and signification of an OpenSSL certificate is in the last chapter and finally, a simple application of online Banking is created.
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