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Advanced methods of filtering network traffic in the Linux system
Peša, David ; Komosný, Dan (referee) ; Kacálek, Jan (advisor)
This master's thesis is meant to provide techniques in designing and building a standalone packet filtering firewall in Linux machines, mainly for small sites who don’t give much service to Internet users. It deals with attenuating the effect of the most common types of attacks using iptables. It guides how to design, implement, run, and maintain Firewall. Techniques for continuously monitoring attacks is attempted. It also give a historical, architectural and technical overview of firewalls and security attacks.
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Library for database access in PHP language
Ondra, Martin ; Šimek, Milan (referee) ; Kacálek, Jan (advisor)
Bachelor thesis describes modern website scripting language PHP, MySQL database and very closely describes functionality of Model-View-Controller design pattern, which can be used in programming database-oriented aplications. On the basis of described theoretics findings is build a library in PHP and MySQL, which matches Model from Model-View-Controller design pattern.
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Multilayer J2EE web application
Pacvoň, Stanislav ; Kacálek, Jan (referee) ; Burget, Radim (advisor)
This thesis provides compact solutions and shows process, how it is possible to implement Information system which automatically tests students projects. The use of J2EE technology is required in assignment of this thesis. Using of other technologies depends on which way of the assignment´s solution was choosen. In the part one of the thesis an option of technologies used for the system development is implemented. The reason why used application server, database server and CMS solution were chosen is given here. The choice of CMS applicatin is reasoned in more detailed way. A building tool Ant and Junit package are introduced here as well as cascade styles and other technologies used in an application. Ant was used to build a module and students projects. JUnit package is available to test classes. In the second part of the thesis the application is designed. It is showed here how to create a web module, what components the module has to contain and how to implement required function of the system with contribution of classes, library OpenCms and Java. The second part is divided into three chapters. The first shows system workflow, which defines the way of work with application according to defined role in system .The second of them is focused on the web module and its parts. It introduces application pages designed for registration, projects assignment, projects and scripts upload and navigation pages. The three chapter is aimed at a web content. It introduces a data files and HTML output pages. Other parts of the thesis are focused on the safety of the application and the way of communication with Jplag detection of plagiarism.
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Centralised web-based personal data management system
Mazur, Kornel ; Kacálek, Jan (referee) ; Malý, Jan (advisor)
This diploma thesis deals with a central user identification and personal data management on the Internet. The first part analyzes questions of a identification process and discusses the requirements for implementation, security and user-friendliness. Subsequently, the process is designed with respect to the defined requirements. A detailed overview of possible attacks to the system and means of protection against them is also included in the thesis. The described methods are as follows: Phishing, Man in the middle, hardware modification and acoustic keypress emissions. A practical design of a identification system is discussed in the second part of the thesis. It consists of two parts: a library implementable to individual Internet services requiring a user identification and a server centrally identificating the users and storing their personal data and passwords. An implementation in Joomla content management system is also described.
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Application for content management of Internet pages
Kaplan, Jiří ; Míča, Ivan (referee) ; Kacálek, Jan (advisor)
This master’s thesis is focused on description of .NET Framework, versions, architecture, assembly and data formats. Describes programming language C#, his supporting programming processes and architecture. Contains description of ASP.NET, characteristics, used directories, control items and design model Model-View-Controller. Next part describes usability .NET background for creation of aplication and comparsion with PHP. Shortly introduces with ADO.NET, databinding, databases, his types and SQL language and content management system. At the end is desribed database structure of content management system, user administration and his parts and functions.
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Adaptive Linux firewalls, geographic firewalls
Najbr, Ondřej ; Kacálek, Jan (referee) ; Pelka, Tomáš (advisor)
The aim of the Bachelor's thesis is to study and describe the options of adaptive firewalling, which has a Linux firewall netfilter, and to study the advanced routing and marginally geographic IP filtering. In detail I will deal with the work with Iptables and its using in creation of firewalls for the Linux operating system. In the next section in detail I will describe the design and implementation Linux applications of creating rules in Iptables.
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Generator of ASP pages
Hrbáček, Martin ; Míča, Ivan (referee) ; Kacálek, Jan (advisor)
Submisson of my project is identification with background ASP.NET and realization program for creating ASP pages based on database structure. I began with my study from Microsoft .NET Framework, which provides all tools and technologies for creating .NET aplications. I described features a structure ASP.NET. I followed also, for my project, very important tool ADO.NET, which contains rich group of functions for manipulation with lot of date types. In text I also described object model of this tool. One of parts is about very important ObjectDataSource class. Next part of my project is devote to SQL database and tools for managing and manipulation. One chapters is devote to System register, which serve for database description. Next is described some of realization this type of program. My work is finished by description of my program. Here are aplications of mentioned technologies, which together forms web aplication and her output is web page for data presentation.
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Attacks on active network elements
Ščepko, Richard ; Kacálek, Jan (referee) ; Polívka, Michal (advisor)
The bachelor thesis deals with the topic of the security of computer networks. The tasks of the bachelor thesis are the attacks on active network elements with the aim of the catching of data between two users. In the created structure with a stellate topology, the user stations have connect to the active element (switch). In the thesis, the individual ways of attacks and the significance of ARP proceedings to MAC addresses have describ. Several programmes have use in order to take control over the device. Due to a big amount of these active elements the source code of the programmes had to be alter. The work with the programmes ARPtool and ARPoison demanded the operational system Linux, in our case the distribution of Ubunt. The programme WinArpAttacker could be set off under the system Windows XP as well. The achieved results and the description of the practical part are discuss in detail in the summary of the thesis. The result is the catching communication with the help of the programme WireShark.
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Simulating the control of a network element with neural network
Šilhan, Petr ; Kacálek, Jan (referee) ; Škorpil, Vladislav (advisor)
The thesis deals with the use of neuronal networks for the control of telecommunication network elements. The aim of the thesis is to create a simulation model of network element with switching array with central memory, in which the optimization control switching array is solved by means of the Hopfield neural network. All source code is created in integrated environment MATLAB with the use of Neural Network Toolbox.
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Application of neural networks in telecommunications
Šulák, Michal ; Koula, Ivan (referee) ; Kacálek, Jan (advisor)
This Master’s Thesis consists of description of current routing protocols and routers, basic principles of neural networks and their interpretation in connection with the use for routing in data networks and telecommunications networks. In the thesis I focused on neural networks, which use energetic functions to find solution stabled states and their use for data routing. I produced the application software to test and find suitable variables for each function. This application counts the shortest path and is able to change variables to reach the best solution of stabled state of neural network. These solutions are compared with other functions that are usually used in nowadays systems for data network routing.
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