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The design and cryptanalysis of the AES (Advanced Encyption Standard)
Říha, Jan ; Vábek, Jiří (referee) ; Tůma, Jiří (advisor)
Nazev prace: Konstrukce a kryptoanalyza AES (Advanced Encyption Standard) Autor: Jan Říha Katedra: Katedra Algebry Vedouci bakalafske prace: Doc. RNDr. Jin Tuma, DrSc. E-mail vedouciho bakalafske prace: Jiri.Tuma@mff.cuni.cz Abstrakt: V pfedlozene praci studujeme nejnovejsi symetrickou blokovou sifru AES. Nejprve se zabyvame vyvojem a vznikem sifry od vypsani souteze a2 po vyhlaseni vitezneho kandidata. Pote se venujeme jejf konstrukci, ve ktere se vyuziva nekterych netrivialnich poznatku algebry pfi praci s polynomy nad konecnym telesem. V teto kapitole je tez popsana prima inverzni sifra a ekvivalentni inverzni sifra slou^ici k desifrovani zasifrovanych dat. Ve tfeti kapitole zkoumame navrhovane implementace sifry AES na jednotlive platformy a nakonec rozebirame mozne utoky a odolnost Sifry AES vuci nim. Klicova slova: AES, sifra, implementace, kryptoanalyza Title: The design and cryptanalysis of the AES (Advanced Encyption Standard) Autor: Jan ftiha Department: Department of Algebra Supervisor: Doc. RNDr. Jin Tuma, DrSc. Supervisor's e-mail address: Jiri.Tuma@mff.cuni.cz Abstract: In the present work we study the newest symetric block cipher AES. At first we consider development and creation of the cipher from the start of selection proces till announcement of winning candidate. Then we turn to its...
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Slope stability calculations for small dams
Hajda, Jindřich ; Hodák,, Jiří (referee) ; Říha, Jaromír (advisor)
There are approximately 20 000 small dams in the Czech Republic. This number entails many ponds or small flood attenuation reservoirs, which provide protection against floods. We do not know much about the structure and material properties of these earth dikes. Concerning the small dam stability the current technical standard ČSN 75 2410 focuses foremost on the angle of both the upstream and downstream slopes in case of different materials, and the method of the stability assessment in case of a dam height being 6m or more. Most of these earth dikes are still standing in spite not being built according to any technical standards. They do not follow any standards mostly because they were built before the modern technical standards were published. This diploma thesis focuses on assigning the degree of a reserve in the safety factor for studies of 5 homogeneous earth dikes and 3 inhomogeneous earth dikes. The calculation was done using the Plaxis 2D software using to the shear strength reduction method. The Calculation of the safety degree is made for 4 typical load cases.
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Evaluation the Financial Situation of the Selected Business Entity
Říha, Jan ; Pfeiferová, Daniela (advisor) ; Romana, Romana (referee)
The aim of the thesis is to evaluate the financial situation of the selected company Eutit Ltd. for a selected period. The firm is the world's largest producer of fused basalt. Assessing the financial situation will be made for the period 2012-2015.
The theoretical part focuses on the theoretical foundations of financial analysis, describes its objectives, principles of the method used most in practice provides a current view on the issue of financial analysis.
The practical part describes the selected company, its history and present. For the evaluation of economic situation of company Eutit Ltd. was the use of horizontal, vertical analysis, financial ratios analysis using bankruptcy or credibility models. Subsequently, the calculated values of indicators will be compared with the industry average values.
In conclusion, the evaluated results of the financial analysis are to determine the overall economic effectiveness of the selected company with evaluated as very positive.
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Analýza vinařského a vinohradnického odvětví ve vybraném regionu
Říha, Jakub
The subject of the diploma thesis is the evaluation of wine and wine growing industry in the Czech Republic and Argentina, and its comparison. The work describes the current situation of the market in wine tourism and opportunities for further development. In conclusion, based on analyzes and marketing research are developed recommendations for the development of wine tourism in the Czech Republic.
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Employee’s Benefits
Matuška, František ; Říha, Jan (referee) ; Křížová, Zuzana (advisor)
The aim of this bachelor thesis is to describe benefits of employees and the manner in which they are used by employers and utilized by employees; it also concerns arguments for their utilization. The thesis examines tax and accounting aspects of the benefits of employees and determines a solution to the selected types of the benefits from the perspective of Czech legislation.
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Stresas-strain analysis of masonry dam
Betlach, František ; Richtr, David (referee) ; Říha, Jaromír (advisor)
The Diploma thesis deals with the assessment of global and local stability of the masonry gravity dam Pastviny, for two load conditions. The first part consists of a present state review describing selected masonry dams in the Czech Republic and abroad. Further on a conceptual and mathematical formulation of the seepage flow and strain-stress problem are stated. The case study is focused on the practical application of formulated problems on the Pastviny dam. Firstly the available data have been assembled and processed. Global and local safety of the dam was assessed for the selected most vulnerable profile of the dam body. In the final chapters 5, 6 and 7, the seepage flow, stress and strain have been calculated and graphically displayed. Finally global and local stability have been assessed and completed with final summary of the results and concluding remarks.
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