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Security of Electronic Documentation in Medical Environment
Hauserová, Markéta ; Malinka, Kamil (referee) ; Barabas, Maroš (advisor)
Thesis is analyzing czech laws which are related to medical documentation. Describes the points which are mandatory for information system, so the medical documentation can be stored electronically. Includes various algorithms for implementation of certain electronic signature and for identification of person. This thesis deals with asymmetric cryptography, specifically RSA, DSA, and ECDSA. Describes the hash functions and their functions and their characteristics. Describes the principle of the certificate, ways of its obtaining, invalidation and their formats. Analyzes medical information system and suggests ways to create a program for signing medical records. Then based on that analysis, the program is implemented. At the conclusion of the work is discussed, if created program meets the criteria.
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Bitcoin Mining Acceleration
Novotný, Jan ; Veselý, Vladimír (referee) ; Kajan, Michal (advisor)
This master's thesis deals with virtual currency called Bitcoin. It describes the functioning of the currency of technical perspective especially the implementation of the transaction, the way of its validation and ensuring the integrity by using cryptographic functions. Furthermore, it describes the principle of the Bitcoin creation, particularly mining method called pooled mining. The thesis also describes the communication protocols and design of architecture to acceleration of the bitcoin mining. Finally, there are described tests, assessment and proposals for the continuation of work.
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Safe Cryptography Algorithms
Mahdal, Jakub ; Hanáček, Petr (referee) ; Chmelař, Petr (advisor)
This thesis brings a reader an overview about historical and modern world of cryptographic methods, as well evaluates actual state of cryptographic algorithm progressions, which are used in applications nowadays. The aim of the work describes common symmetric, asymmetric encryption methods, cryptographic hash functions and as well pseudorandom number generators, authentication protocols and protocols for building VPNs. This document also shows the basics of the successful modern cryptanalysis and reveals algorithms that shouldn't be used and which algorithms are vulnerable. The reader will be also recommended an overview of cryptographic algorithms that are expected to stay safe in the future.
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Bloom Filters and Their Properties
Prokop, Tomáš ; Kajan, Michal (referee) ; Puš, Viktor (advisor)
A dissertation is engaged in a description and a construction of the Bloom filter. The inventor of this filter is Burton H. Bloom. The Bloom filter represents an efficient tool for storing elements into the universal aggregate in the form of a data structure. It processes large volume of data while filling less of store space. The data structure makes it possible to insert elements and their time after time selecting in the aggregate with zero probability of errors. Part of the dissertation is explanation of properties and usage methods of the data structure including possibility of a reduction acceptable errors. An expansion of the Bloom filter is computed Bloom filter, which allows broader usage of the data structure.
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Performance tests of cryptographic algorithms
Pospíšil, Karel ; Martinásek, Zdeněk (referee) ; Sobotka, Jiří (advisor)
Bachelor's thesis deals with analysis of the various cryptographic algorithms that are used for securing communications. The first part is devoted to symmetrical cryptographic algorithms, asymmetric cryptographic algorithms and hashing functions. The second part deals with the security classification and attacks that are used to attack cryptographic algorithms and hash function. The third part deals with the selected testing algorithm RC4 and MD5 hashed function for using CrypTool. The final section provides an evaluation and test results of algorithm RC4 and MD5 hashing function.
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Design of security infrastructure for electronic archive
Doležel, Radek ; Lattenberg, Ivo (referee) ; Zeman, Václav (advisor)
This master's thesis deals with design of security infrastructure for electronic archive. In theoretical part is disscus about technical resources which are based on security services and protocols and methods which are used for protection. On basics of theoretical part is designed model of security infrastructure and it is built in laboratory. Model of security infrastructure is based on Open Source Software and as safety storages for private user authentication data are used cryptographic USB tokens. This master's thesis includes design and construction of real infrastructure of secured electronic archive. In each part of master's thesis is put main emphases on security and clear explanation from the beginning of desing of model of security infrastructure for electronic archive to finish of construction.
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Hash functions and their usage in user authentication
Piller, Igor ; Stančík, Peter (referee) ; Hajný, Jan (advisor)
This thesis concerns with hash functions and their usage in authentication. It presents basics of hash functions theory and construction elements. In particular the thesis focuses on LMHash, MD4, MD5 and SHA family hash functions, which are compared from the security point of view. The thesis describes in general the most frequently used hash function attacks, points out the weaknesses of current construction and mentions the future perspective of hash functions. Furthermore the thesis outlines the area authentication and describes usage of hash functions in the area. Practical part of the thesis contains an implements of a general authentication framework implemented in programming language C#. The result is client and server applications, in which two selected authentication methods were successfully tested. The result implementation is flexible with respect to the possible future use of other authentication methods.
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Electronic signature and its use in accounting
Guzý, Ladislav ; Mejzlík, Ladislav (advisor) ; Singerová, Jana (referee)
Diploma thesis is focused on matters of electronic signatures and their possible usage in accounting and business process. The paper is divided into two parts. Subject of the first part is general analysis of terminology and characteristics of electronic signature, certificates and certification authorities and time stamps, including analysis of strengths and weaknesses of these services. At the end of this theory part are outlined some of the most common choices of using electronic signature in accounting system. In second part are analysed results of research, which was performed by sending questionnaire to a number of randomly chosen companies.
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Electronic signature for emails subscribing
Rychetský, Filip ; Toman, Prokop (advisor) ; Brechlerová, Dagmar (referee)
Práce se zabývá využitím elektronického podpisu k podepisování emailových zpráv a to přehlednou a jasnou formou s praktickými příklady. Zahrnuje obecnou charakteristiku elektronického podpisu jako takového, věnuje se kryptografickým základům, aby čtenář věděl, jakými metodami a principy je podpis zajištěn, a konkrétními možnostmi podepisování s důrazem na jednu variantu. Tato podrobněji popsaná varianta je konfrontována s dalšími možnostmi, zejména v oblasti výhod a nedostatků.
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