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Web application for automated network design
Grenčík, Dominik ; Dvořák, Jan (referee) ; Kubánková, Anna (advisor)
This master thesis focuses on creating a web application for the automated design of computer networks in the context of the rapid development of information technologies and their crucial role in the business environment. The work consists of theoretical and practical parts, with the theoretical part addressing the development of web applications, necessary programming languages, and tools, as well as the theory of computer networks and their design. The practical section includes the design and implementation of the backend with a relational database and the frontend with a description of components and functionality. The developed web application demonstrates how automated network design contributes to efficient planning and implementation of computer networks.
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Web browser for seniors
Nguyen, Tuan Ninh ; Kubánková, Anna (referee) ; Komosný, Dan (advisor)
The thesis deals with the design and implementation of a basic web browser that is adapted for seniors in the age group of 90 years and more. It is one of the applications of the operating system for the elderly, which is used to facilitate the work on the computer. The web browser is developed in Python. It allows text enlargement, web page display, voice assistance and protection against fraudulent sites (phishing). The browser is easy to use. Every event in the browser is logged to an activity record with different levels for security risk assessment. Sending the entered information to the guardian of the elderly person is also implemented in the web browser, which occurs if the senior launches a fraudulent web page. This increases the protection of seniors from fraudulent attacks. The results of this work are published in the GitHub repository.
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Analysis and design of an effective solution for integration of Web Application Firewall into SOC architecture
Hynek, Vojtěch ; Komosný, Dan (referee) ; Kubánková, Anna (advisor)
The thesis deals with the issue of integration of Web Application Firewall into the environment of Supervisory Security Center. The result of this thesis is an analysis of current integration options along with identification of the most common attacks on web applications. Using the analysis performed, the best suited WAF was selected along with its integration method. Furthermore, the thesis contains a detailed description of the chosen integration and its subsequent testing. Testing of the correctness of the firewall, its stress testing and its effect on the network delay was performed. A part of the thesis also describes the integration of WAF into a real SOC environment. The integration involves connection to log management and traffic monitoring technologies. At the same time, a custom integration with the MISP platform has been developed, which makes it possible to create dynamic rules for the WAF. The integration includes the creation of a custom parser, correlation rules and a test scenario. The last part of the thesis is devoted to the analysis of the impact of the WAF integration on the prevention and detection of cyber threats, which includes an evaluation of the emerging alerts over a period of one month.
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Secure, reliable and adaptive network based on Cisco devices
Lefler, Přemysl ; Komosný, Dan (referee) ; Kubánková, Anna (advisor)
This bachelor thesis deals with design of secure, reliable and adaptive network using Cisco network devices. Thesis includes design of a network with description of each individual technology, that were used in the design to meet requirements for safety, reliability and adaptivity. The last chapter describes frequently occuring network attacks along with a description of their execution followed by implementation of defense against them.
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JavaME Group SMS Messaging Interface
Kubina, Tomáš ; Kubánková, Anna (referee) ; Kovář, Petr (advisor)
This Diploma Thesis have been describing possibilities of Wireless Messaging API, which are used for applications handling with Short Messages. It have been describing basics of programming language JavaME, basics of formating and sending SMS, detailed analysis of Wireless Messaging API, application, which is part of my diploma thesis and finally Security Politics of JavaME programming language.
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Queue Management in Network Active Elements
Pancák, Matej ; Kubánková, Anna (referee) ; Koton, Jaroslav (advisor)
This thesis is mainly focused on efficiency of data handling on active network elements and monitoring of transmission speeds in real and testing networks. The purpose of this work is to create and implement algorithm which is able to reorganize list of Mangle rules. The purpose of this optimization is to raise data processing efficiency and decrease communication delay as main QoS parameter. The result of the work is series of measurements in order to confirm the effect of optimizations on the transmission and other parameters.
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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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Automatic Classification of Digital Modulations
Kubánková, Anna ; Novotný, Vít (advisor)
This dissertation thesis deals with a new method for digital modulation recognition. The history and present state of the topic is summarized in the introduction. Present methods together with their characteristic properties are described. The recognition by means of artificial neural is presented in more detail. After setting the objective of the dissertation thesis, the digital modulations that were chosen for recognition are described theoretically. The modulations FSK, MSK, BPSK, QPSK, and QAM-16 are concerned. These modulations are mostly used in modern communication systems. The method designed is based on the analysis of module and phase spectrograms of the modulated signals. Their histograms are used for the examination of the spectrogram properties. They provide information on the count of carrier frequencies in the signal, which is used for the FSK and MSK recognition, and on the count of phase states on which the BPSK, QPSK, and QAM-16 are classified. The spectrograms in that the characteristic attributes of the modulations are visible are obtained with the segment length equal to the symbol length. It was found that it is possible to correctly recognize the modulation with the known symbol length at the signal-to-noise ratio at least 0 dB. That is why it is necessary to detect the symbol length prior to the spectrogram calculation. Four methods were designed for this purpose: autocorrelation function, cepstrum analysis, wavelet transform, and LPC coefficients. These methods were algorithmized and analyzed with signals disturbed by the white Gaussian noise, phase noise and with signals passed through a multipass fading channel. The method of detection by means of cepstrum analysis proved the most suitable and reliable. Finally the new method for digital modulation recognition was verified with signals passed through a channel with properties close to the real one.
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Communication node Localization Techniques in Wireless Sensor Networks
Pekárek, Jan ; Kubánková, Anna (referee) ; Šimek, Milan (advisor)
The bachelor´s thesis describes wireless sensor networks and communication protocols. Below this thesis contains basic algorithms for localization techniques communication nodes in wireless sensor networks. These basic algorithms are classified by methods. The bachelor´s thesis values algorithms by their advantages or disadvantages for usage in the suggested localization algorithm. In this thesis is solved a new simulating programme J-SIM, peruse separate package that are useful in the wireles sensor networks. In J-SIM is created a sensor network and models separate communication nodes. Models communication nodes are created separately for sensor nodes and target nodes. For localization algorithm is created program in the programming language Java which run results from simulating programme J-SIM. Programme J-SIM, simulation created by virtue of Tcl script and final programme are applied to CD.
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