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SIP security
Tůma, Petr ; Šilhavý, Pavel (referee) ; Ježek, Jiří (advisor)
This bachelor thesis focuses on security issues of the SIP signalling protocol. The goal was to carry out three attacks and design defences against them. The chosen attacks were a flood attack, a modified message attack and a man-in-the-middle attack. The attacks were conducted against the Asterisk PBX and the results show that some attacks were able to prevent communication between the PBX and clients. Defensive measures are described for each attack in the mitigation subchapter.
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Clouds and Hills Generation Using Fractal Geometry
Tůma, Petr ; Zuzaňák, Jiří (referee) ; Venera, Jiří (advisor)
This work is concerned with generation of landscape objects using fractal geometry. In this work is explained what the fractal is and terms associated with them. The other parts describe basic theoretical ideas and implementation of these algorithms. The Capital theme is generation of models clouds and hills in values of input parameters, their presentation and date media saved there. The project includes my algorithm extension for hills generation of course. At the conclusion of this work are summarized tendencies of next development and my results.
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Development of HPLC-MS/MS methods for selected, biologically active compounds
Hrabáková, Kateřina ; Bosáková, Zuzana (advisor) ; Tůma, Petr (referee)
This thesis is focused on the development of an UHPLC-MS/MS method for the determination of lactone and carboxylate form of topotecan in aqueous buffers (Part 1) and on the development of a HPLC-MS/MS method for monitoring the extraction efficiency of 6 organic UV filters from aqueous matrices using deep eutectic solvents and terpenes (Part 2). Topotecan is an important anticancer drug that inhibits topoisomerase I, but only its lactone form is pharmacologically active. In the first part of this work, the change in the ratio of lactone and carboxylate form of topotecan in time was studied as a function of sample pH and the pH of the aqueous component of the mobile phase. For this purpose, a 19-minute UHPLC-MS/MS method with a C18 stationary phase, gradient elution and electrospray ionization in positive mode was developed. It was observed that with an increasing pH of the mobile phase and the pH of the sample, the mass fraction of the carboxylate form of topotecan in the sample increased as well. The same trend was also observed with increasing time since sample preparation. If methanol was added to the sample, a stabilization of the lactone form and a slower transition to the carboxylate form was observed. These findings can be further exploited to optimize the use of topotecan in medicine. The...
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Linux encryptor of network traffic
Tůma, Petr ; Sysel, Petr (referee) ; Hajný, Jan (advisor)
This master’s thesis is focused on network traffic encryption on Linux platform. Goal of the thesis was to create an IPv4 network traffic encryptor. The chosen encryption method is encryption of the entire packet on the virtual interface. The encryptor uses methods from classical, quantum and post-quantum cryptography. Network traffic is encrypted with the AES-GCM-256 algorithm with a hybrid key established using QKD and CRYSTALS Kyber.
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Portability in zlomekFS
Šnupárek, Aleš ; Tůma, Petr (advisor) ; Yaghob, Jakub (referee)
ZlomekFS is a distributed file system created for transparent sharing of directory trees designed for the Linux operating system. This work deals with the possibility of zlomekFS portability to another operating system especially the Microsoft Windows. It also explores the possibility of porting zlomkeFS to the Android operating system.
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Use of capillary electrophoresis with UV photometric and electrospray ionization mass spectrometric detection for the study of interaction of compounds
Konášová, Renáta ; Jaklová Dytrtová, Jana (advisor) ; Mikšík, Ivan (referee) ; Tůma, Petr (referee)
Capillary electrophoresis (CE) is highly efficient separation method based on the different migration velocity of ions in liquid media in electric field. It is commonly used in analytical laboratories and due to the different separation principle it is applied as a complementary method to the chromatographic methods (HPLC and UHPLC). Beside the applicability of CE for quantitative/qualitative analysis, the method can be used also for physico-chemical characterization of compounds (e.g. determination of acid dissociation constants of weak electrolytes or stability constants of complexes). This work is focused on the applicability of CE methods for determination of physico- chemical characteristic of compounds (acid dissociation constants of triazole fungicides and stability constants of dibenzo-18-crown-6, benzo-18-crown-6 and 18-crown-6 ether complexes with metal ions in hydro-organic solvent mixtures) and on the possibility to use affinity CE (ACE) with electrospray ionization-mass spectrometric detection (ACE- ESI/MS) for the study of non-covalent interactions of compounds. For the online hyphenation of CE and ESI/MS, two highly sensitive CE-ESI/MS interfaces were tested: i) porous tip and ii) nano-sheath liquid flow. The ability of the CE-ESI/MS interfaces to effectively decouple spray and...
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Regression Benchmarking Web
Babka, David ; Tůma, Petr (advisor) ; Parízek, Pavel (referee)
During the software development the performance of the software is often important part of client requirements. Considering the constant development process of the software, comparison of the performance testing results could pinpoint to various defects in the source code, which could lead to optimizing software and its performance. This thesis focuses on implementation of flexible web application created for retrieving the performance results and presenting them in plots and other forms. The plots are dynamically generated to provide as much transparency as possible. This application will also provide the ability to send e-mails to users with the information about new measurement results.
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Peer To Peer Component Framework
Klačko, Tomáš ; Tůma, Petr (advisor) ; Šerý, Ondřej (referee)
The Peer To Peer Component Framework is a software framework that allows components to be instantiated on network nodes that satisfy required runtime conditions at the time of their instantiation. The thesis presents the Framework design together with its prototype implementation. From the Framework's point of view, a component is a piece of executable software. Therefore the instantiation of a component on a network node constitutes a remote code execution, which is a security issue. Because the aim of the Framework is to be practically usefull, it provides a way to use existing security software for this matter. Above all, the Framework design requirements and its prototype implementation are driven by use cases. The two main use cases are also presented in the thesis.
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