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Digital certificates and certificate authorities
Lepa, Ondřej ; Hajný, Jan (referee) ; Člupek, Vlastimil (advisor)
This diploma thesis deals with certification and certification authorities, certification path PKI and principles of its validation and security. Also deals with structure of certificate itself and possible misuse of included information. Moreover, possibility of misues of third party certificates and proclamation of untrusted certificate to client's system.
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Digital signature
Vaverka, Aleš ; Lambertová, Petra (referee) ; Zeman, Václav (advisor)
Digital signature, the subject of this semester paper, is nowadays very up-to-date. The still rising capabilities of the internet and the vision of lowering the amounts of paper documentation made it necessary to develop a way of signing documents which are transferred through the internet. This is supposed to be equally safe and unassailable as the handwritten signature. This method is called the digital signature. The paper focuses on the explanation of the essential terms connected to digital signature, such as certificate, certification authority, authentication, but in particular on the elementary cryption algorithms, further on applications that make use of digital signature, e.g. post services and electronic banking. In the final chapter, the positive and negative aspects of the electronic signature are discussed.
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Software support of education in cryptography based on integer factorization
Vychodil, Petr ; Martinásek, Zdeněk (referee) ; Burda, Karel (advisor)
This thesis deals with new teaching software, which supports asymmetric encryption algorithms based on the issue of large numbers´ factorization. A model program was created. It allows to carry out operations related to encryption and decryption with an interactive control. There is a simple way to understand the principle of the RSA encryption method with its help. The encryption of algorithms is generally analysed in chapters 1,2. Chapters 3 and 4 deals with RSA encryption algorithm in much more details, and it also describes the principles of the acquisition, management and usage of encryption keys. Chapters 5 suggest choosing of appropriate technologies for the creation of the final software product, which allow an appropriate way to present the characteristics of the extended RSA encryption algorithm. The final software product is the java applet. Aplet is described in the chaprers 6 and 7. It is divided into a theoretical and practical part. The theoretical part presents general information about the RSA encryption algorithm. The practical part allows the users of the program to have a try at tasks connected with the RSA algorthm in their own computers. The last part of Java applet deals with the users´ work results. The information obtained by the user in the various sections of the program are satisfactory enough to understand the principle of this algorithm´s operations.
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Lab of public key infrastructure
Slavík, Petr ; Lambertová, Petra (referee) ; Burda, Karel (advisor)
The aim of this thesis is to study and describe the theme of Public Key Infrastructure (PKI). Within the scope of minute PKI characterization there is a gradual depiction of particular structural elements, which are above all represented by cryptographic operations (asymetric and symetric cryptography, hash function and digital signature); then, there are also individual PKI subjects that are dealt with, like eg. certification authority, certificates, security protocols, secure heap etc. Last but not least there are a few complete Public Key Infrastructure implementation solutions described (OpenSSL, Microsft CA). The practical part of the thesis, a lab exercise, gives potential students the knowledge of installing OpenSSL system based certification authority. The next task educate students how to secure web server with certificate signed with own CA and also how to secure web server users‘ access control through certificates signed by the previously installed CA.
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Infrastructure of public keys
Bědajánek, Ondřej ; Malý, Jan (referee) ; Pust, Radim (advisor)
The subject of my thesis dscribes function and principles of the public key infrastructure as well as certificate authority. Under the operation system Linux was created self signed certificate authority. Web interface was devoloped in PHP for the purpose of the generation, distribution and rejection certificates. Configuration files for OpenVPN are included in the thesis and wireless security is achived by OpenVPN.
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Implementation of certification authority and digital signature
Troják, Martin ; Koutný, Martin (referee) ; Lambertová, Petra (advisor)
This master´s thesis deals with problems of certification authorities and digital signature. There are analyzed principles of digital certificates and certification authorities. It describes the the most widely used cryptosystems and hash functions, which are used in communications with certificates and digital signature. Analysis is focused on Public key infrastructure standard, which describes rules of creating of certification authority and digital signature. There is also described detailed principle of digital signature. Next chapters deals with studying of protocol SSL, principles of functions and usage of SSL. Practical part of this thesis realizes certification authority and information system. There is shown used software and configuration of it. Last part describes procedures during using aplication and her realization.
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RSA Algorithm and Its Use in Electronic Communication with State Authorities
FROULA, Stanislav
This bachelor thesis focuses on the RSA algorithm and it's use in electronic communication. The RSA algorithm is curently one of the most widely used asymmetric encryption algorithms. It was first publicly described in 1977 by the mathematicians Ron Rivest, Adi Shamir, and Leonard Adleman. It's the first algorithm that is suitable for both electronic signature and public key encryption. The theoretical part explains all related concepts of cryptography. The basic operating principle of the algorithm is described in specific simplified example. It also includes a description of public key encryption and a list of institutions, which use digital signature to verify authenticity of the sender. The practical part focuses on a questionnaire survey, which investigates the awareness level of internet banking users in term of security of using internet banking and following the security policy recommended by banks. The results are analysed and evaluated at the end of the thesis.
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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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Použití elektronického podpisu v ČR
Janošek, Tomáš ; Tichý, Vladimír (advisor) ; Lukašovská, Renáta (referee)
Elektronický podpis je metoda zabezpečení a odstranění anonymity při elektronické komunikaci. Práce představuje elektronický podpis se všemi přednostmi i nedostatky, ukazuje jeho možnosti jak při komunikaci mezi přáteli tak zejména při komunikaci s orgány státní správy a soukromými společnostmi. Dala si za cíl poskytnout zájemcům konkrétní návod na získání dat pro tvorbu elektronického podpisu, podpisových i šifrovacích certifikátů, jejich integraci do operačního systému, webového prohlížeče i e-mailového klienta. V závěru navrhuje možné substituty pro placené služby certifikačních autorit jako např. zabezpečení komunikace pomocí OpenSSL, nebo OpenPGP.
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Internet marteting and ICT in Vietnam
Nguyen, Anh Tuan ; Štědroň, Bohumír (advisor) ; Kratochvil, Milan (referee)
The thesis deals with general theory of internet marketing, its opening and discrete premises for functioning, positive sides and threats that internet marketing can bring. An important part of the thesis is drawing an image of the current level of ICT infrastructure and the situation in internet marketing aplication in Vietnam.
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