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Wireless network security implementation variants
Nečas, Ondřej ; Růčka, Lukáš (referee) ; Stančík, Peter (advisor)
The aim of the thesis is to introduce the reader into the issue of the data transfer via wireless network which is a rapidly evolving and widely applied field.The work mainly deals with the important issue of how to secure a wireless connection correctly and effectively. In the beginning, the work provides the introduction into the basic terms of the field. Then, the basic types of a wireless network security are introduced together with the related standards of the wireless transmission security. Furthermore, the fundamentals of the information cryptography are explained as well as the basic principles of the most frequently used means of the Wi-Fi network security. The practical part comprises the demonstration of individual penetration attacks on the most frequent types of security features and standards used in the wireless networks.
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Creation of network drivers for the Windows family of operating systems
Krkoš, Radko ; Hošek, Jiří (referee) ; Růčka, Lukáš (advisor)
This thesis describes the approach in designing and implementing a driver marking network traffic for quality of service provision. In the beginning distinct technologies usable for the driver development are discussed and compared to each other while the most suiting candidate is chosen for driver development. Next the thesis discusses the design of the driver according to specification and depicts a list of more specific requirements affecting the driver design itself. The focus point in design is the least possible impact on network traffic performance and the running system itself. In addition to the driver an application programming interface usable from user mode is designed and so the system as a whole ensures the marking of network traffic entirely. In the end the created driver architecture is described and the application programming interface is described in terms of use.
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Analysis and modeling of network data traffic
Paukeje, Ján ; Novotný, Vít (referee) ; Růčka, Lukáš (advisor)
Theses deals with network traffic modeling focused on elaboration by time series analysis. The nature of network traffic is discussed above all http traffic. First three chapters are theoretical, which describes time series and basic models, linear AR, MA, ARMA, ARIMA and nonlinear ARCH. Other chapters define terms like self-similarity and long range dependence. It is demonstrated a failure of conventional models which cannot capture these specific properties of network data traffic. On the basis of study in chapter 6. is closely described the combined ARIMA/GARCH model and its parameter estimation procedure. Applied part of this theses deals with procedure of estimation and fitting the estimation model to observed network traffic. After an estimation a few future values are predicted on the basis of estimated model. These predicted values are consequently compared with real data.
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Password deposition techniques in operating systems
Pavlík, Martin ; Růčka, Lukáš (referee) ; Hajný, Jan (advisor)
This master thesis deals with ways to store passwords in current operating systems. Specifically, this work focuses on Windows, Linux, BSD and OS X. These systems are examined for ways of hashing passwords and on resistance of resulting hashes against various attacks. First (theoretical) section describes the procedures and algorithms that are needed for user authentication. This part also describes methods of hash storing. At the end of the theoretical part are generally described some possible attacks against hash functions. In second (practical) part is described and tested tools for obtaining hashes of the investigated operating systems. Subsequently practical attacks were conducted against obtained hashes by using appropriate tools. Furthermore there are presented results of the attacks. In the conclusion of the work there is a comparison of tools and methods which were used to obtain plaintext passwords from operating systems.
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Broadcast and multicast services in mobile networks
Konštanský, David ; Růčka, Lukáš (referee) ; Novotný, Vít (advisor)
This bachelor studies describe differents principles and possibilities of groupsending of multimedia data in contemporary mobile network with the intention of a Multimedia Broadcast/Multicast Service in UMTS networks. This work analyse the architecture of solutions, processes of data transmission and types of coding of multimedia content of this service in UMTS networks. This paper also consider actual situation of application of Multimedia Broadcast/Multicast Service in 3G networks and offer a comparison of technologies of the standard DBV-H.
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Analysis of MANET Routing Protocols OLSR and AODV in OPNET Modeler Simulation Environment
Machata, Tomáš ; Růčka, Lukáš (referee) ; Hošek, Jiří (advisor)
The thesis deals with MANET networks and it focuses on the routing process. Most attention is paid to the routing protocols AODV and OLSR. These protocols are described in the detail. The aim of the thesis is to create a simulation model of MANET network in OPNET Modeler environment. In this model the AODV protocol is configured. In order to achieve improved characteristics of the network traffic the routing protocol parameters are optimized. Furthermore the process model of AODV protocol in this environment is studied and extended by a new type of message, which allows a transfer of current transmission speed of MANET station network interface. Current transmission rate of stations is retrieved from the statistics. Every station periodically sends a message to neighboring nodes. The node stores the information into the file when a new message arrives.
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SMS Application for JavaME Platform
Růčka, Lukáš ; Burget, Radim (referee) ; Kovář, Petr (advisor)
The aim of this diploma thesis is to study the potential of Java ME platform for receiving and sending of SMS and to utilize obtained information subsequently in implementation of an application for this platform. The first part of the diploma thesis aims at explaining general terms of the Java language and its basic features. The next part deals with specific properties of the Java ME platform and properties of devices that support this platform. A design of the Java ME application based on theoretical knowledge is created then. This application has to be able to receive, process, store and send SMS and communicate with the server application based on the Java SE platform. The created Java ME application serves as an automated SMS voting server, which can be used in mobile devices that support the Java ME platform and can be remote-controlled via Internet from the Java SE platform application. The final chapter presents the results and conclusions of testing of the created application on real mobile devices.
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Mathematical modelling of WWW network traffic
Papšík, Lukáš ; Růčka, Lukáš (referee) ; Molnár, Karol (advisor)
The aim of this thesis was to practically use theoretical knowledge of the semestral work. The scope of work was to analyze long term operation of an emphasis on obtaining the necessary parameters for selected models. Network analyzer was used for two programs that have received the required parameters. How do I edit the captured data that can be used in programs described in the work. In this work I focus on two models, the Stochastic model and Markov-modulated Poisson’s. Each of these models requires different parameters. These were obtained from the captured traffic. Furthermore, the modeled traffic compared with the real. It was found that none of the models is not sufficiently capable of accurately modeling the behavior of the network, if it comes to cluster of packets. However, if traffic shown linear character models were able to model this traffic.
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Design of labs for Cisco academy courses
Oujezský, Václav ; Růčka, Lukáš (referee) ; Jeřábek, Jan (advisor)
This master's work deals with the design of laboratory exercises for Cisco Academy courses. Especially is oriented on Cisco technology. The theoretical part describes various devices used in the laboratory and the issue of functionality of these devices, such as switching, routing and solve any problems with the configurations of these elements. The practical part is directly generated designs laboratory exercises, focusing on specific examples of the problems from the configuration and network management with Cisco. An integral part of work consists of supporting the presentation of individual laboratory tasks, including configuration files, settings of the device. Create labs and verify the functionality of their configuration has been realized in the laboratory Cisco Academy Brno.
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Configuration of QoS in IP network using Cisco devices
Brož, Kamil ; Šporik, Jan (referee) ; Růčka, Lukáš (advisor)
This bachelor's thesis is divided into two main sections. The first, theoretical section, deals with parameters and requirements of modern real-time applications. This project analyses the particular means of providing QoS. It deals with access in a form of integrated services (IntServ) and with newer access in a form of differentiated services (DiffServ). The chapter covering the Integrated services describes the very basic principles of the problematics. Differentiated services and used algorithms are discussed in detail. The second, practical section, describes the capabilities of Cisco devices and their particular implementation in two designed network scenarios including traffic measurement and user experience tests.
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