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Authentication Using Lightweight Cryptography
Člupek, Vlastimil ; Uchytil, Stanislav (referee) ; Dostál, Otto (referee) ; Zeman, Václav (advisor)
The dissertation thesis deals with cryptographic protocols for secure authentication of communicating parties, which are intended primarily for low-cost devices used in Internet of Things. Low-cost devices represent computationally, memory and power constrained devices. The thesis focuses mainly on the possibilities of using mathematically undemanding cryptographic resorces for ensuring integrity of transmitted dat, authenticity of and secured transmission of data on low-cost devices. The main goals of the thesis focus on the design of new advanced cryptographic protocols for ensuring integrity of transmitted data, authenticity, confidentiality of transmitted data between low-cost devices and authenticity with non-repudiation of done events. The thesis describes proposal of three authentication protocols, one unilateral authentication protocol and two mutual authentication protocols. The thesis also describes proposals of two protocols for secured transmission of data between two devices, one protocol without a proof of receipt data and one protocol with proof of receipt data. In this thesis is also performed a security analysis and a discussion to proposed protocols.
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Fittings catalogue for low pressure sewer networks
Hlavínek, Jakub ; Kocůr, Pavel (referee) ; Ručka, Jan (advisor)
Thesis describes the actual state of low pressure sewer systems designing, basic characteristics of low pressure sewer systems and design basics in Czech republic and abroad in accordance with czech and european standards. Next part contains description of fittings used in low pressure sewer and emphasizes its key role in design, service and maintenance of the system. Based on gathered informations the fittings calatogue for low pressure sewer networks was created. Followed subjects were closing fittings, backflow valves, cleaning sets and bleeding- and aerating vents. The last part of the bachelor thesis is a test of softsealing backflow valve for the purpose of tightness definition.
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Rain impact on FSO link attenuation based on theory and measurement
Brázda, V. ; Schejbal, V. ; Fišer, Ondřej
The FSO link becomes a usual mean of modern wireless communications. But it suffers from atmospheric particles causing attenuation. That´s why this random attenuation must be carefully considered by the FSO link design. As it is known the most serious atmospheric phenomenon is fog, and low cloudiness. But the rain attenuation (night mare of mm wave links) is not negligible on optical links, too. In this contribution we focus on rain attenuation from theoretical as well as experimental point of view. Statistics and rain event analysis are shown. There is an overview and a comparison of several formulas for rain attenuation derived from DSD or rain rate. Rain is not the worst phenomena for the transmission but we can’t neglect its influence on FSO. Only full understanding of influence of real atmosphere can lead to solution of a high availability of FSO systems.
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Low-Latency Architecture for Order Book Building
Závodník, Tomáš ; Kořenek, Jan (referee) ; Dvořák, Milan (advisor)
Information technology forms an important part of the world and algorithmic trading has already become a common concept among traders. The High Frequency Trading (HFT) requires use of special hardware accelerators which are able to provide input response with sufficiently low latency. This master's thesis is focused on design and implementation of an architecture for order book building, which represents an essential part of HFT solutions targeted on financial exchanges. The goal is to use the FPGA technology to process information about an exchange's state with latency so low that the resulting solution is effectively usable in practice. The resulting architecture combines hardware and software in conjunction with fast lookup algorithms to achieve maximum performance without affecting the function or integrity of the order book.
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Utilizing Unconventional CMOS Techniques for Low Voltage Low Power Analog Circuits Design for Biomedical Applications
Bay Abo Dabbous, Salma ; Horský, Pavel (referee) ; Ďuračková, Daniela (referee) ; Khateb, Fabian (advisor)
Tato disertační práce se zabývá navržením nízkonapěťových, nízkopříkonových analogových obvodů, které používají nekonvenční techniky CMOS. Lékařská zařízení na bateriové napájení, jako systémy pro dlouhodobý fyziologický monitoring, přenosné systémy, implantovatelné systémy a systémy vhodné na nošení, musí být male a lehké. Kromě toho je nutné, aby byly tyto systémy vybaveny baterií s dlouhou životností. Z tohoto důvodu převládají v biomedicínských aplikacích tohoto typu nízkopříkonové integrované obvody. Nekonvenční techniky jako např. využití transistorů s řízeným substrátem (Bulk-Driven “BD”), s plovoucím hradlem (Floating-Gate “FG”), s kvazi plovoucím hradlem (Quasi-Floating-Gate “QFG”), s řízeným substrátem s plovoucím hradlem (Bulk-Driven Floating-Gate “BD-FG”) a s řízeným substrátem s kvazi plovoucím hradlem (Bulk-Driven Quasi-Floating-Gate “BD-QFG”), se v nedávné době ukázaly jako efektivní prostředek ke zjednodušení obvodového zapojení a ke snížení velikosti napájecího napětí směrem k prahovému napětí u tranzistorů MOS (MOST). V práci jsou podrobně představeny nejdůležitější charakteristiky nekonvenčních technik CMOS. Tyto techniky byly použity pro vytvoření nízko napěťových a nízko výkonových CMOS struktur u některých aktivních prvků, např. Operational Transconductance Amplifier (OTA) založené na BD, FG, QFG, a BD-QFG techniky; Tunable Transconductor založený na BD MOST; Current Conveyor Transconductance Amplifier (CCTA) založený na BD-QFG MOST; Z Copy-Current Controlled-Current Differencing Buffered Amplifier (ZC-CC-CDBA) založený na BD MOST; Winner Take All (WTA) and Loser Take All (LTA) založený na BD MOST; Fully Balanced Four-Terminal Floating Nullor (FBFTFN) založený na BD-QFG technice. Za účelem ověření funkčnosti výše zmíněných struktur, byly tyto struktury použity v několika aplikacích. Výkon navržených aktivních prvků a příkladech aplikací je ověřován prostřednictvím simulačních programů PSpice či Cadence za použití technologie 0.18 m CMOS.
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Economic research bulletin (2008, No.1)
Česká národní banka
The CNB has been targeting inflation for ten years now. We have decided to take this opportunity to present recent CNB research related to the inflation targeting strategy. The first two articles contribute to the discussion about how the inflation targeting strategy should be evaluated. They both point out that it is not enough simply to count how many times inflation was on target. One alternative way of measuring the success of the strategy is suggested in the first article. Partial simulations with the forecast model can help us understand the reasons for deviations of inflation from the target. Another alternative is proposed in the second article, which emphasises that success is conditional on transparent and consistent communication of inflation factors. The next two articles focus on one of the most prominent features of the inflation process – persistence – and its implications for the inflation targeting strategy. They both find that inflation persistence may be lower in the Czech case than one might expect. The third article – based on microeconomic data – provides evidence that inflation persistence has declined during the ten years of inflation targeting. The fourth article – based on macroeconomic data – estimates the level of the inflation target perceived by the public and illustrates that the strategy has gained credibility and has managed to stabilise perceived inflation at low levels.
Fulltext: PDF
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Economic research bulletin (2006, No.2)
Česká národní banka
One of the major challenges faced by the central banks of candidate countries for euro adoption is preparation for and a subsequent successful stay in the ERM II regime for at least two years while complying with the exchange rate stability criterion. This issue of the Bulletin points to the results of three papers analysing the prospects for successful sailing to the euro via ERM II as well as the risks that may emerge. Roman Horváth brings some optimism by concluding that the current levels of exchange rate variability and pressures are at the level of the euro area countries before their euro adoption, because a number of the candidates seem to be well aligned with the euro area countries. Aleš Bulíř and Kateřina Šmídková nevertheless warn that the candidates with trend real appreciation may experience problems with exchange rate misalignment in ERM II , especially if they stay longer than the minimum required period and if they accumulate high external debt during the cruise. They conclude that success in passing through ERM II is to a large extent dependent on the general success of the economies, strong economic performance being the key. Since it depends not only on domestic policies, but also on the external conditions, some element of luck is an inevitable part of the whole adventure. Luboš Komárek and Martin Melecký highlight one of the possible approaches to the estimation of the equilibrium exchange rate essential for setting the central parity before entry into ERM II – the behavioural equilibrium exchange rate (BEER ). Their estimates of exchange rate misalignments confirm that periods of low economic activity coincide with periods of an overvalued currency. Potential overvaluation therefore presents a really major risk for ERM II .
Fulltext: PDF
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Low-level data reading from computer data storages
Šalko, Jaroslav ; Ležák, Petr (referee) ; Burda, Karel (advisor)
The following work is topically focusing on data restore of selected memory devices. It could be divided into two theoretical parts and one practical. The first part consist explanation of these memory media’s structure, the mechanism of their storage and also how operating system approaches these data. This relates also to a file system, which is among with its most commonly used types described there as well. In the second theoretical part the study focuses on the storage damage problematics. Various types of damage are shown and I examine how we could approach them. The work concentrates on possibilities which owners of the damaged storage media have with an emphasis on specialized companies. Therefore the study contains brief information of four selected domestic companies which are offering data restore on the Czech market. The complete list of services, which these companies offer to their customers, is shown in the chart found by the end of chapter. The second option in order of solving media damage problems are freeware programmes. On the basis of an internet poll dealing with the topic „best programmes for data restore“, I have chosen three programmes to be examined. The examination consisted of uploading certain files on the media storage which was formated by high level method afterwards. Through these three programmes I tried to restore the lost data. The results are included in a chart found by the end of each sub-chapter. The practical part of my work deals with linux program for data restore DDrescue. My effort consists of developing and creating an user friendly interface with intuitive manipulation of this helpful tool. My goal is thus spreading this program into the public and providing them simple tool for efficient low-level data restore.
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Seismic test of the switching devices on the low voltage
Dubský, Martin ; Mikyska, Kamil (referee) ; Dostál, Lukáš (advisor)
This work analyzes the seismic tests to valid technical starnards. Here is explained the term technical standard and written summary requirements for seismic resistance circuit breakers low voltage. The work includes devices suitable for the purpose and extreme laboratories dealing with seismic tests. The final section provides a draft test station with estimated economic return. Seismic tests are a very important part in the design of not only switching technology. It allows you to simulate the selected mechanical effects which may on the unit during operation or transportation to work and increase its reliability.
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