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Extraction of information from identity documents
Hudcovský, Erik ; Lattenberg, Ivo (referee) ; Caha, Tomáš (advisor)
This thesis is about the processing information from personal documents (ID card or passport) into the form that is further easily to be processed for computers and the IT industry in general. This process is implemented by the application I developed as part of my bachelor's thesis. The application contains the scanned document, the document type and the form of the required output. As the output we get the document type in the required format. The entire application is using in process an external OCR tool (OpticalCharacter Recognition), which is implemented so that it can be easily replaced by another OCR tool. I used Tesseract in my application. This OCR tool is the simpliest and most accurate of the free OCR tools at the same time. It also has strong community support and is still being developed. In this thesis, I also focused on its testing, both on the samples of text I created, and on real scans of documents. The application is also processed as an installation package, so it can be easily imported into other projects. The entire application is displayed as OpenSource on GitHube under the free license of MIT.
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Dedicated VoIP communicator
Bičák, Tomáš ; Číka, Petr (referee) ; Caha, Tomáš (advisor)
The bachelor's thesis deals with the design of a simple VoIP communicator on a Raspberry Pi. An external ReSpeaker 2 Mics Pi HAT sound card is connected to the Raspberry Pi. The utility is written in the Python programming language.
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Reduction of CentOS operating system
Vashkevich, Pavel ; Caha, Tomáš (referee) ; Komosný, Dan (advisor)
The goal of this bachelor's thesis is to perform a reduction of the Linux operating system. For minimalization was entered the Linux distribution CentOS 8, which is created on the basis of open-source code. This code are spread by Red Hat. The theoretical part describes the basic components of the operating system, including the Linux kernel, drivers and graphical interface. The practical part describes the suggestion of a method for minimizing the operating system. This method also includes a comparison of lightweight web browsers. The resulting size after reduction is 731 MB. Minimization automation software is published in the personal repository on GitHub under the MIT license.
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Analysis of malware
Bláha, Michael ; Caha, Tomáš (referee) ; Člupek, Vlastimil (advisor)
The aim of my bachelor thesis is to design a safe environment for the analysis of malicious software. In the theoretical part of the work, I deal with the basic division of computer viruses. Next, I describe two main procedures for malware analysis, namely static and dynamic analysis. I describe why they are used and what tools fall into these categories. I also present my methodology for secure malware analysis. In the practical part of the work, I focus on creating an analytical environment on Windows 10 and Fedora platforms. I use a graphical environment and a command line to create virtual machines. For the analysis of network traffic, I create the so-called "Fake Internet" program with the INetSim program. In the last part of the work, I deal with a sample analysis of selected types of computer viruses. I follow the described methodology. For each analysis, I describe a brief summary and results. At the end of the work, I describe a possible defense against malicious software.
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Management of servers with Fedora operating system
Šuba, Filip ; Caha, Tomáš (referee) ; Komosný, Dan (advisor)
The diploma thesis deals with a tool for managing research projects in the global experimental network PlanetLab. It is possible to use the Planetlab server manager application for administration. As part of this work, the application was extended with new functions, which are mainly: obtaining information about the status of operation of individual servers, advanced server search according to the size of the server's operating memory, Linux kernel version. Furthermore, the feature of managing servers outside the Planetlab experimental network and the feature of copying files to selected servers were added. The application is available in the PyPI repository and the source code is published on the GitLab platform under the MIT license. The application is available for Linux and Mac OS. A manual in English was prepared for the application.
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Analysis of email spam sources
Caha, Tomáš ; Kubánková, Anna (referee) ; Komosný, Dan (advisor)
The first part of this thesis deals with an approach of designing and developing of application for IP geolocation using various geolocation databases. Methods of geographical location of network devices and amount of available data provided by chosen commercial and freely accessible geolocation databases are presented. The data are summarized with focus on methods of obtaining information about IP addresses from various databases. In the paper there are also presented ways used to develop the Python application and its parts, which can be easily reused in other programs. The command line program was created to demonstrate that all parts of the developed application work properly. The whole application is freely accesible under the conditions of the MIT license, published on GitHub (https://github.com/tomas-net/ip2geotools/) and in the Python package index PyPi. The second part of this thesis deals with the description of cyberthreats and the use of developed application to mass geolocation of IP addresses that are listed in chosen freely accessible lists as sources of email spam or cyberattacks. Geographical analysis of cyberattacks sources shows countries of origin. Results of analysis are presented in graphs and maps.
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Extraction of information from web pages
Caha, Tomáš ; Burget, Radim (referee) ; Komosný, Dan (advisor)
This thesis deals with the separation of information from websites of selected geolocation services. Methods of geographical location of network devices and amount of available data provided by chosen freely accessible geolocation databases. The data are summarized with focus on methods of obtaining information about IP addresses from APIs of particular databases. In the paper there are also presented ways used to develop the system for automatic estimation of geographic location of IP addresses specified in source file and process of comparing retrieved data with reference data. The system is created in Python and provides a simple way for verifying information about given IP addresses in five freely accessible databases. Furthermore, accuracy of the retrieved data is evaluated and five geolocation databases is compared.
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Combi-Cycle with piston engine
Kubik, Martin ; Caha, Tomáš (referee) ; Fiedler, Jan (advisor)
The scope of this diploma thesis of focused on processing and calculation of the technological scheme for combi-cycle power plant with piston engine using heavy fuel oil. There are analyzed demands of piston engine for HFO and design of technological process preparation. This thesis analyzes the suitable locations, service options and alternative solution - heating plant with piston engines. Benefits of each option are assessed in the economic model, assuming power as a source of base load and providing support services. The results are intended to assess feasibility of the investment project.
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Biomass energy power plant
Caha, Tomáš ; Ing.Ladislav Pivečka (referee) ; Fiedler, Jan (advisor)
The scope of this diploma thesis is feasibility study of enlargement the current energy source by new technological equipment designed for heat and electric energy production. Technological equipment is designed regarding to capital costs and minimum enviromental effects. In the thesis is described most important aspects for successful design new biomass energy source. The result can be used for investor´s decision making about determination toward investment.
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