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Digital Steganalysis
Dufek, Petr ; Fukač, Tomáš (referee) ; Strnadel, Josef (advisor)
This bachelor thesis deals with the field of digital steganalysis and implementation of steganalysis tool. It contains a summary of several existing tools and methods. It describes in detail LSB and PVD methods used for image steganography. It also describes steganalysis methods Chi-Square, PDH and RS analysis. The thesis includes introduction of steganalysis method SameColor. This method is based on the analysis of the length of sequences of pixels that follow each other in an image without changing the bits used for steganographic insertion of data by the LSB method. This method is effective in detecting steganograms created from cover images in the form of digital icons and symbols, where it achieves more than 95% success in classifying the analyzed images. As part of the work, a script was created for automated generation of the data set using the PVD method implemented in the xStego tool and an auxiliary script to evaluate success in classifying the analyzed files. The Chi-Square, PDH and SameColor methods were successfully implemented in the steganalysis tool in Python and their reliability in detecting steganograms was evaluated.
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Analysis of Selected Indicators of the Company ČSOB, a.s. Using Time Series
Dufek, Radim ; Dufek, Petr (referee) ; Kropáč, Jiří (advisor)
This bachelor‘s thesis deals with the analysis of selected indicators of the company ČSOB, a.s. The first part of this thesis clarifies theoretical resources of time series and regression analysis. The second part of this thesis is focused on the analysis of selected indicators using the knowledge from the first part. If it is possible, data will be aligned by regression function and forecast for the future will be made.
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Business plan for starting a company
Dufek, Petr ; Procházková, Veronika (referee) ; Khateb, Fabian (advisor)
This master's thesis deals with a processing of a business plan for establishing a company offering computer courses for beginners and intermediate users. The first part contains theoretical knowledge related to this thesis. The second part contains necessary analyses and the solution’s proposal. Created financial plan proves his viability.
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Stanovení oxidu siřičitého ve víně standardními i alternativními metodami
Dufek, Petr
This thesis focuses on the study of domestic and foreign literature on the determination of sulfur dioxide in wine. A detailed description of the standard and alternative methods, their analysis, identification of possible shortcomings or disadvantages and specifying strengths and advantages. Theory obtained by studying literature is verified by a several samples of wine are provided different forms of sulfur dioxide with different methods . Subsequently, the results obtained by various methods are compared in terms of accuracy and applicability in the viticultural practice. Everything should be processed in order that the thesis could become an additional study material for university students.
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Analysis of Selected Indicators of the Company ČSOB, a.s. Using Time Series
Dufek, Radim ; Dufek, Petr (referee) ; Kropáč, Jiří (advisor)
This bachelor‘s thesis deals with the analysis of selected indicators of the company ČSOB, a.s. The first part of this thesis clarifies theoretical resources of time series and regression analysis. The second part of this thesis is focused on the analysis of selected indicators using the knowledge from the first part. If it is possible, data will be aligned by regression function and forecast for the future will be made.
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Business plan for starting a company
Dufek, Petr ; Procházková, Veronika (referee) ; Khateb, Fabian (advisor)
This master's thesis deals with a processing of a business plan for establishing a company offering computer courses for beginners and intermediate users. The first part contains theoretical knowledge related to this thesis. The second part contains necessary analyses and the solution’s proposal. Created financial plan proves his viability.
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Stanovení oxidu siřičitého ve víně standardními i alternativními metodami
Dufek, Petr
This thesis focuses on the study of domestic and foreign literature on the determination of sulfur dioxide in wine. A detailed description of the standard and alternative methods, their analysis, identification of possible shortcomings or disadvantages and specifying strengths and advantages. Theory obtained by studying literature is verified by a several samples of wine are provided different forms of sulfur dioxide with different methods . Subsequently, the results obtained by various methods are compared in terms of accuracy and applicability in the viticultural practice. Everything should be processed in order that the thesis could become an additional study material for university students.
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