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Network Attack Generator
Buček, Hynek ; Košař, Vlastimil (referee) ; Bartoš, Václav (advisor)
This thesis is focused on the study of the best-known network attacks, especially on those that can be theoretically detected without knowledge of the contents of transmitted messages. The goal is to use the basis of acquired knowledge to create a tool that will simulate the behavior of the communication in different network attacks. Simulation outputs will be used for testing the quality of security tools designed to defend against network attacks. The simulator will be used only for offline testing, it will not be possible to carry out real attacks. Purpose of this work is to improve the security against network attacks nowadays.
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Safety risks of current routers
Bubelíny, Peter ; Vymazal, Michal (referee) ; Vychodil, Petr (advisor)
The thesis aims to study and document the problem router security. It present the characteristic information about a router, functions, types and locations in a computer network. Because router is integrated part of network, next are described the most commonly types of attacks and generally available security technologies. The thesis also offers insight into the router as a safety device in the role of the throat network, part of the deeper security infrastructure or access point in wireless networks. Next are described the selected security technologies against some of already mentioned attacks and also are offered opportunities to improve safety router. The next are demonstrated DoS and brute-force attacks on router in ethernet network and attacks based on sniffing packets on router in wireless network. Finally, the results are presented.
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Network attacks of Linux operating system
Valčák, Richard ; Janovič, Filip (referee) ; Pelka, Tomáš (advisor)
Main objective of this bachelor thesis is to inform with the most famous security attacks, describe their characteristics, evaluate risk degree and suggest security against of these attacks. The bachelor work presents theoretical and practical part focused on security attacks of Linux operational system. First chapters describe operational system security shell theory. Followed by the most frequent attacks like Buffer overflow, ARP Cache poisoning, SYN flood , Denial of Service, DHCP, which are described theoretically, demonstrated by these examples and possible security assignment against this attacks registered. Basic theoretical system Linux knowledge is necessary for the practical part of the bachelor thesis.
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Analysis of the wireless network security
Bencel, Jozef ; Koutný, Martin (referee) ; Jeřábek, Jan (advisor)
This master's thesis deals with security of wireless network standard 802.11. There are described security mechanisms as hide SSID, MAC address filtering, WEP, WPA, WPA2 protocols. There are described also the most often kinds of attacks (Denial of Service, disclosure WEP key, Man-in-the-Middle). The work contains investigation of used security mechanisms in wireless networks in parts of Brno. There were used NetStumbler and inSSIDer applications for this measurement. The last part of work contains measurement of security mechanisms (WEP, WPA, WPA2) effect to transfer rate from the point of view of the end user. The measurement was realized with Iperf application.
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Proxy firewall
Kugler, Zdeněk ; Pelka, Tomáš (referee) ; Pust, Radim (advisor)
This diploma thesis deals with the topic of proxy servers and firewalls and considers other associated technologies and network techniques. It systematically describes the general issues of firewalls, with a special focus on proxy firewalls and their safety. Additional systems mentioned in this document are intrusion detection systems (IDS), antivirus systems and content control filters – as these are also connected with safety of networks, servers and workstations or with limiting various Internet sources. IDS systems can be typically supplemented with various additional applications or tools that enrich them and increase their potential – including graphic additions. This part is remembered too. Some systems can communicate with each other, which is successfully utilised (FW & IDS co-operation, for example). The purpose of the first large chapter is to present firewall technologies, to list firewall types, their basic functionality and to present the final comparison. It marginally mentions firewall applications in practice. Chapter two explains the theory of network address translation (NAT), deals with its functionality, safety and with limiting the NAT mechanism. Chapter three brings a comprehensive presentation of proxy servers. It explains their principle from the point of view of functionality and the specification of application areas. The chapter is complete with a clear list of proxy server types and their descriptions. The last chapter named Linux Proxy Firewall is the key part of the work. It deals generally with the Linux platform, the Debian GNU/Linux distribution, principles of safety policy, network configuration, network server safety, Linux firewalls (Netfilter framework, Iptables tool) and with the Squid proxy server. The following subchapters respect the previous structure: they describe the theories of intrusion detection systems, antivirus checks and content filtering based on different methods. All this is presented similarly to the previous chapters. A proxy firewall solution built on the Linux operating system has been proposed in the practical part. The Debian GNU/Linux distribution has been chosen, being very suitable for server use due to its features. This environment is also used for additional safety software contained in the proxy firewall: antivirus protection, content filtering and an intrusion detection system. The priority is the most comprehensive computer network security, which requires detection abilities with the broadest possible coverage in the area of network safety. The purpose of this diploma thesis is not only to describe the principle of operation of proxy servers and to compare them with other types and other systems, but it also brings my own proposed free solution, which increases network safety and has the ambition of comparing it with clearly commercial products available on the market.
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