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RedirFS - Application on Data Encryption
Zůna, Pavel ; Bidlo, Michal (referee) ; Kašpárek, Tomáš (advisor)
This thesis focuses on design and implementation of a cryptographic filter for the Redirecting Filesystem Framework (RedirFS for short) in the form of a Linux kernel module. It starts by giving the reader a general overview of modern cryptography and encryption. Before diving into the filter specifics, it takes a tour of the most important features of RedirFS. When done with introductory chapters, it describes the design choices made considering their benefits and limitations. The final chapter is completely devoted to cipherflt: a proof of concept implementation of the cryptographic filter.
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Hardware Accelerated Digital Image Stabilization in a Video Stream
Pacura, Dávid ; Orság, Filip (referee) ; Drahanský, Martin (advisor)
Cílem této práce je návrh nové techniky pro stabilizaci obrazu za pomoci hardwarové akcelerace prostřednictvím GPGPU. Využití této techniky umožnuje stabilizaci videosekvencí v reálném čase i pro video ve vysokém rozlišení. Toho je zapotřebí pro ulehčení dalšího zpracování v počítačovém vidění nebo v armádních aplikacích. Z důvodu existence vícerých programovacích modelů pro GPGPU je navrhnutý stabilizační algoritmus implementován ve třech nejpoužívanějších z nich. Jejich výkon a výsledky jsou následně porovnány a diskutovány.
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Alignment of DNA Parts
Pejř, Václav ; Burgetová, Ivana (referee) ; Rozman, Jaroslav (advisor)
This thesis deals with finding the possibilities within the sphere of alignment of DNA sequences. Based on these findings, the best solution should be found with regard to the quickness of computation and quality of alignment. Following this I intend to implement and thus create a functioning program that will do the alignment. The thesis starts with introducing issues dealing with biology, DNA and genetics. The introduction is followed by a survey of algorithms that are used for alignment, their evaluation and selection of the most appropriate algorithm for the implementation. The thesis also focuses on the usage of parallel programming by means of OpenCL libraries. The alignment is being done above many sequences at the same time, so that the methods how this process can be done and how to reach the best results are being examined.
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Real time Linux latency analysis
Krajíček, Peter ; Macho, Tomáš (referee) ; Valach, Soběslav (advisor)
The thesis analyzes the causes of delays when using the operating system GNU/Linux. It describes a few selected types of analysis, which then implemented using the C programming language. Itself measurement is made on the kit with OMAP3530 microprocessor and the Linux kernel.
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User Oriented QoS System
Plchot, Oldřich ; Matoušek, Petr (referee) ; Kašpárek, Tomáš (advisor)
This master's thesis deals with the possibilities how to guarantee the quality of service in the area of computer networks using a GNU/Linux operating system. This work compares and evaluates tools which are necessary to guarantee the quality of service. The goal of this work is to discuss the advantages and disadvantages of these tools and to design a system which handles the problem of quality of service. Designed system uses a heuristics, which allows the user to set up the quality of service system without studying specific properties of communication protocols on the network or application layer. This work also includes a theoretical introduction into the quality of service and computer networks.
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Memory Management in Linux
Tuček, Jaroslav ; Kočí, Radek (referee) ; Vojnar, Tomáš (advisor)
This work describes the memory manager subsystem of the linux kernel. The first part gives a brief account of operating systems architecture and memory management theory - of virtual memory management, page tables, page replacement algorithms and kernel allocators in particular. The second part discusses the actual implementation of these principles in a modern kernel - in linux. Finally, a series of tests stressing the memory subsystem is conducted to determine the memory manager's real behaviour. Limitations of the current linux kernel memory management and some of their proposed solutions are also discussed.
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Monitoring and Analysis of Users Using DLP System
László, Peter ; Janoušek, Vladimír (referee) ; Drozd, Michal (advisor)
The purpose of this work is presenting Data Loss Prevention systems, describing each element of it and writing down advantages and disadvantages of these systems. This document contains required knowledge about filter drivers and I/O request packets. According to this knowledge it is possible to design a user application, which based on the principles of Data Loss Prevention systems is able to prevent sensitive data from leaks. Created application is a mini-filter driver, which allows tracking operations of marked files with monitoring and filtering IRP packets. This document also contains detailed desing, implementation, testing and reviewing of created program.
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The PXA270M ARM module and its usage as private branch exchange
Vojtíšek, Jindřich ; Šilhavý, Pavel (referee) ; Daněček, Vít (advisor)
This work deals with using the operating system Linux on diskless devices. This is solved on the development kit Voipac PXA270M, which is based on the ARM processor. This work deals further with the distributions of the Linux operating system, which are suitable to use for the device based on the ARM processor. The Linux was chosen because it is one of the most flexible operating systems and the Linux is kept as open source software code, except to the distribution of the Red hat and a few special distributions. The NFS protocol and TFTP are described there. The TFTP and NFS are used to deploy the operating system. It describes there, what are the TFTP and NFS and the principle of their use in computer networks. Practical part is as to, what is needed for the functioning of the TFTP and NFS server on the Ubuntu 11.10 plus how configure them. The OpenOCD is another part of this work. The OpenOCD is designed to work in the device memory. There is shown how to install and run the OpenOCD in order to communicate with the development kit Voipac PXA270M. This work shows how to configure the bootloader U-boot for booting the operating system from the network using the NFS and TFTP. There is described how compile and install PBX Asterisk on Voipac PXA270M with use of cross compiler and how cross compile zlib, OpenSSL and ncurses needed to install nad run Asterisk.
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Rootkit for MS Windows
Trutman, Michal ; Tomec, Martin (referee) ; Procházka, Boris (advisor)
This bachelor's thesis deals with methods of attack on MS Windows operating system and maps techniques of resources hiding used by existing rootkits. The thesis consists of a theoretical and a practical part. The first part covers classification of the rootkits, introduces the structure of the system kernel and then describes various techniques of attacking the system. In the practical part is described implementation and testing of my own rootkit.
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Advanced Tools for Performance Measurement
Smrček, Jaromír ; Gajda, Zbyšek (referee) ; Kašpárek, Tomáš (advisor)
This thesis presents the I/O layer of Linux kernel and shows various tools for tuning and optimization of its performance. Many tools are presented and their usage and outputs are studied. The thesis then focuses on the means of combining such tools to create more applicable methodology of system analysis and monitoring. The practical part consists of applying SystemTap scripts for blktrace subsystem and creating a fragmentation monitoring tool with graphical output.
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