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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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SMS Encryption for Mobile Communication
Lisoněk, David ; Bouška, Petr (referee) ; Drahanský, Martin (advisor)
This thesis deals with encryption of short text message (SMS) in mobile communication. Introduction is dedicated to overview of the parts of GSM radiotelephone nets and SMS messages transfer . Next chapter is reserved for description of cryptographic methods especially symetric and asymetric encryptografic aproaches. A design of a SMS messages encryption and decryption techniques is in next. For SMS encryption and sign, there is used the asymetric cypher RSA. Encryption use OAEP padding schema. The public key is saved in certificate. The Symbian OS has been choosen as a suitable platform for programming of mobile devices.
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Online DNSSEC Records Validation
Bachtík, Martin ; Čejka, Rudolf (referee) ; Lampa, Petr (advisor)
Master's Thesis is studying an extension that secures the domain name system by introducing the verifiability of authenticity of data, known as DNSSEC. Productive output is proposal of application and its subsequent implementation that at each stage of browse the namespace to the selected domain name checks the appropriatenesses of this extension and in detail reports the trusted chain.
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Modern Asymmetric Cryptosystems
Walek, Vladislav ; Sobotka, Jiří (referee) ; Malina, Lukáš (advisor)
Asymmetric cryptography uses two keys for encryption public key and for decryption private key. The asymmetric cryptosystems include RSA, ElGamal, Elliptic Curves and others. Generally, asymmetric cryptography is mainly used for secure short messages and transmission encryption key for symmetric cryptography. The thesis deals with these systems and implements selected systems (RSA, ElGamal, McEliece, elliptic curves and NTRU) into the application. The application can test the features of chosen cryptosystems. These systems and their performance are compared and evaluated with the measured values. These results can predict the future usage of these systems in modern informatics systems.
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End-to-end encryption protocol for IEEE 802.15.4
Bača, Jaromír ; Člupek, Vlastimil (referee) ; Krajsa, Ondřej (advisor)
Tato práce se zabývá problematikou šifrování komunikace mezi nízkonapěťovými zaří-zeními, které jsou ovládány pomocí mikrokontrolerů. V rámci práce byly používány dvěvývojové desky deRFnod, které byly osazeny čipy AVR ATmega 128 RFA1, které umož-ňují bezdrátovou komunikaci. Na těchto zařízeních probíhal vývoj a testování aplikace.Finálním výstupem práce je návrh aplikace pro asymetrickou výměnu klíčů, která jezaložena na eliptických křivkách. Tato aplikace je implantována v Atmel LightWeight,kde je i řešena otázka vzájemné komunikace mezi komunikujícími body. Vygenerovanýklíč je dále použit pro širfování komunikace pomocí šifrovacího algoritmu AES, který jejiž implementován ve využitém LightWeigt protokolu. Toto šifrování umožňuje nejenomšifrování koncových bodů, ale i komunikačního tunelu. Taková ochrana poskytuje uži-vatelům anonymitu dat a znemožňuje nebo velmi znesnadňuje potenciálním útočníkůmzařízení fyzicky lokalizovat na základě znalosti směrování dat v síti.
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Asymmetric Cryptography on FPGA
Dobiáš, Patrik ; Smékal, David (referee) ; Malina, Lukáš (advisor)
This bachelor thesis deals with the analysis of existing hardware implementations of asymmetric cryptographic schemes on the FPGA platform and the then implementation of the cryptographic scheme Ed25519 on this platform. The resulting implementation is described in detail and compared with existing implementations. At the end of this work, the deployment of this implementation on the Virtex UltraScale+ FPGA is described.
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Portal for the support of cryptography instruction
Forman, Tomáš ; Doležel, Radek (referee) ; Zeman, Václav (advisor)
The main goal of this master's thesis is building of web portal for presentation basic cryptography algorithms. Those algorithms would be explained in the theoretical page in the first place. After that, they would be demonstrated by scripts. One part of this project is designing simplified theoretical element for basic impletion portal of information. Next part is creating web portal by one of the free available CMS´s systems. Programming language JAVA would be used as an instrument for creating demonstration scripts. For creating animations will be used the Flash animation tool. Target of formed web portal is creating community of expert public. It would make new articles, scripts and knowledge. This way, the portal would be kept current. The section which would include failure the most widely used algorithms and instructions how to eliminate it will be part of portal.
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Comparison of Cryptographic Libraries in Linux Environment
Bartoš, Milan ; Malinka, Kamil (referee) ; Barabas, Maroš (advisor)
Bachelor's thesis deals with the comparison of the three cryptographic libraries used in the Linux environment. These are GnuTLS/nettle, NSS and OpenSSL. These are compared in terms of support for basic cryptographic functionality (symmetric and asymmetric ciphers, hash algorithms, SSL/TLS), working with hardware tokens and SSL/TLS. Libraries are also compared in terms of API design with a focus on stability and work with certificates and the possibility of more independent use of the library in a single process.
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