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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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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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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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Visualisation of asymetric cryptography
Kužela, Jan ; Rosenberg, Martin (referee) ; Ležák, Petr (advisor)
Bachelor thesis is considered in cryptographic protocols, especially asymetrical. The purpose of the thesis is to create an aplication for visualisation of mathematical operations in asymetrical cryptosystems. The emphasis is put on the asymetrical cryptosystems Diffie-Hellman, DSA and RSA. There is a summary of history of cryptography in the theoretical part as well as modern cryphographical systems used for protection of digital data. Practical part shows the design and creation of the application and implementation in the programming language Java and JavaFX. The output is the application, which visualizes protocols DH, DSA and RSA. Systems are visualized with the input data from the user or with randomly generated data. Application shows the calculations made by protocols step by step.
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Postquantum cryptography on FPGA
Kek, Sanjin ; Gerlich, Tomáš (referee) ; Smékal, David (advisor)
Subject of this bachelor thesis is postquantum cryptography on FPGA. Focus of theoretical part is to acquaint the reader with FPGA technology, basic principles of VHDL language, current situation in the field of postquantum cryptography and postquantum digital signing scheme CRYSTALS-Dilithium. Increased attention is paid to this scheme. Algorithms needed for function of the scheme, such as SHAKE, NTT and smaller operations used for public key compression, are described. Practical part contains hardware implementation of expandable output function SHAKE and smaller operations, such as Decompose, UseHint, Power2Round and others.
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Electronic identification and trust services in electronic transactions
Hrbotický, Lukáš ; Sikora, Marek (referee) ; Zeman, Václav (advisor)
Bachelors thesis talking about problematics of electronic identification and trust services in electronic transactions. It describes and explains concepts used in the area of electronical communication mentioned in regulation eIDAS. Solutions demonstrating trust services are part of the work. As practical part of this thesis was created laboratory exercise, in which will students try the possibilities offered by certification authority. The goal of this work is explanation and definition of concepts according to eIDAS regulations and realization of system demonstrating these services.
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Secure access to information panel
Procházka, Jaroslav ; Malina, Lukáš (referee) ; Sobotka, Jiří (advisor)
My Thesis deals with secure access to the information panel, which deals with methods of communication of information panels with control unit. There are described the communication interface. The Thesis is focused mainly on communication protocols and security methods of transmission of information. The Thesis deals with the Diffie-Hellman Protocol, which is detailed discussed. There is explained the nature of the attack, the „Man in the middle“ on the Diffie-Hellman Protocol. A method of defense against attack by the „Man in the middle“ by using a digital signature in the Diffie-Hellman Protocol over an unsecured communication channel. In conclusion, the concept is designed for secure communications between the display panel and the control Terminal. There are described in detail the three proposed simulation in the programme.
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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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Electronic geocaching
Pavel, Lukáš ; Babnič, Patrik (referee) ; Burda, Karel (advisor)
The goal is to design and implement a concept of electronic geocaching with contactless smart card and cell phone with NFC interface. In the first chapter I describe geocaching and try to familiarize the reader with this game. The second chapter deals with the issue of smart cards, I describe here the contact and contactless cards and their security. In the third chapter, I describe use and security of radio communication interface NFC. In the fourth chapter, I describe the principles of symmetric and asymmetric cryptography and selected cryptographic techniques. In the fifth chapter is description of proposed solution for electronic geocaching with digital signature. The last chapter describes all created applications.
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Cryptography and modern cryptographic algorithms
Orság, Dominik ; Dobrovský, Ladislav (referee) ; Nevoral, Tomáš (advisor)
The goal of this bachelor thesis is to provide a comprehensive overview of the historical development of cryptography as well as important cryptographic methods of today. The theoretical section begins with an exploration of fundamental concepts and the historical progression of cryptographic algorithms. This is followed by a descroption of modern symmetric and asymmetric algorithms. The greatest attention is paid to the RSA algorithm and its implementation in the Python language.
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