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Advanced methods of Linear Cryptanalysis
Říha, Jan ; Rudolf, Bohuslav (advisor) ; Hojsík, Michal (referee)
In the present work we study advanced methods of linear cryptanalysis. At the beginning, we describe the principle of Matsui's linear cryptanalysis, the two basic algorithms - Algorithm 1 and Algorithm 2, against DES cipher. Further it is described a generalization of linear cryptanalysis and consequently partitioning and statistical cryptanalysis. Then it is followed by a look on the linear approximations over the correlation matrices. Furthermore, we study an improvement of Matsui's Algorithm 2 using Fast Fourier transform, based on circulant matrices theory. Finally we deal multidimensional linear cryptanalysis that uses multiple linear approximations and in the very end we propose an own design of improvement of multidimensional extension of Algorithm 2 by using Fast Fourier transform.
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Serve and return tactics according to the type of tennis surface
Říha, Jan ; Kočíb, Tomáš (advisor) ; Psotta, Rudolf (referee)
SOUHRN: Název: Taktika podání a příjmu podání podle typu povrchu dvorce Serve and return tactics according to the type of the tennis surface Cíle práce: Analýza taktického použití podání a příjmu podání v tenise při hře na travnatých, středně rychlých a antukových površích u předních světových hráčů s následujícím doporučením pro trenérskou praxi. Metoda: Ve výzkumu bylo sledováno celkem 30 vybraných sad z třiceti utkání, z toho 10 na každém z hlavních typů povrchu. Sledování se týkalo mužské kategorie hráčů do stého místa v žebříčku ATP z turnajů v letech 2006 a 2007. Pro sběr dat byla použita metoda nepřímého strukturovaného pozorování a pro jejich analýzu metoda popisná a komparativní. Výsledky: Osvětlují rozdílnost taktického využití podání a příjmu podání v závislosti na typu povrchu dvorce. Klíčová slova: Dvouhra, podání a příjem, taktika, videoanalýza.
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Modern Guidelines Dietary and Dietary Myths
Říha, Jan ; Dlouhý, Pavel (advisor)
This work supposed to be a simplified and comprehensive overview of the basic nutrition recommendations for citizens. The work is divided into two main chapters - conclusions. The first chapter of conclusions informs a common consumer about the basic expressions used in nutrition and also presents a list of products containing basic nutrients and main risks connected with undue/insufficient consummation of such substances. This chapter educate the common consumer and gives him a chance to better orientation among offered foodstuff. The consumer is therefore able to decide more rationally which recommendations is more suitable for him and why. Very important aim of this chapter is so to provide such information that the common consumer could demark unscientific nutrition suggestions (advertisement) from recommendations positively affecting his health. In the second part of the first chapter are presented data according to which one can follow up and alternate a quantity of received energy, advices about BMI and values where lose of weight are already dangerous. The second chapter of conclusions presents the set of nutrition recommendations that were in the most cases introduced in the corresponding chapters. The suggestions are presented by Society for Nutrition in the Czech Republic and Department of...
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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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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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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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Induced abortions in the years 1958-2012 in the Czech Republic
Hegarová, Hana ; Fučíková, Simona (advisor) ; Říha, Jan (referee)
The objective of the thesis primarily is to describe the history and development of the issue of abortion in relation to the various changes that the population of communities have passedthrough and determine whether legislative changes concerning abortion affect abortion indicators. Furthermore, the work focuses on the development of abortion in the Czech Republic in 1958 - 2012.This thesis examines in detail on the development of abortion legislation in Czechoslovakia and later in the Czech Republic and on the basis of these legislative changes values examines the link abortion with indicators made legislative changes. In the context of abortion among other things, analyzes the total fertility rate, total abortion rate, abortion rate of women according to their age, abortion by territorial differentiation and other indicators influencing the number of abortions in the Czech Republic.
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