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Monitoring VoIP Networks
Drozda, Tomáš ; Marek, Marcel (referee) ; Matoušek, Petr (advisor)
This thesis deals with the monitoring VoIP networks. The main objective of this work was to design and then to program monitoring systems for IP telephony network using SIP signaling protocol, primarily for billing purposes. Another important objective was to explore the possibility of obtaining geographic location of the communicating stations. The theoretical part of the thesis deals with the description of the SIP protocol. The rest of the thesis is focused to the design and implementation of the system. The system was implemented as a set of console applications that are complemented by a web application that is used to display the obtained data. Geolocation was solved with the help of IPInfoDb services that provides API for obtaining geolocation information.
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Identity Detection in TCP/IP Architecture
Holkovič, Martin ; Matoušek, Petr (referee) ; Polčák, Libor (advisor)
This work deals with detection of users within computer networks on different layers of the TCP/IP architecture. These identities are identified by protocols running on the appropriate layers of the given architecture. PPPoE and SLAAC protocols were chosen as protocols that are used for network layer address assignments. The second type of protocol is the application protocol SMTP. We analysed communication using the chosen protocols in order to create metadata about the corresponding communication. The results of the analysis are finite state machines. Based on these finite state machines, software for legal interception was designed and implemented. Implemented software was tested on samples of data, in a specialized laboratory, and in a production network.
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Computer Identity Based on Its Internal Clock Skew
Franková, Barbora ; Matoušek, Petr (referee) ; Polčák, Libor (advisor)
Thesis deals with remote computer identification based on its internal clock skew. It describes various methods to collect and evaluate time-related data extracted from TCP, ICMP and Javascript. Software package that implements some of those methods is attached as well. During the work, many experiments were carried out to find out possible effects of certain factors. Tests were aimed on software (operation systems, web browsers and time synchronization) as well as hardware (temperature, power source, distance and network connection type) of the remote systems. Interesting results were discovered in areas of IPv4/IPv6 address pairing and NTP time synchronization.
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Deployment of SIP Server at the FIT for IP Telephony
Hýbner, Lukáš ; Ráb, Jaroslav (referee) ; Matoušek, Petr (advisor)
Master's Thesis is engaged on possibilities connect SIP server to telephone network on FIT. The main reason is that employees can call to university, when they are out of faculty. For resolution we will use SIP server Asterisk, which will be serving as authorization server for users. Next Asterisk will ensure transmission numbers to SIP address with ENUM. In the practical part we will verify the functionality.
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JavaScript Restricting Web Extension
Timko, Martin ; Matoušek, Petr (referee) ; Polčák, Libor (advisor)
The purpose of this thesis is to functionally expand the browser extension prototype created by Ing. Zbyněk Červinka, focused on the privacy protection of the user during his web browsing. Acquired facts about the function of existing tools for safety and privacy protection, such as technology JavaScript Zero, were used in the solution, which was created by employing a technique of encapsulating JavaScript objects and functions. This allows greater anonymity and safety for users during web browsing. The extension was tested and published under the title JavaScript Restrictor. The main benefit of this thesis is the increase of safety from attacks and increase of anonymity linked to the user data harvesting.
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SNMP Agent for IoT Devices
Polishchuk, Kateryna ; Grégr, Matěj (referee) ; Matoušek, Petr (advisor)
The aim of this work is to create a SNMP agent for monitoring IoT devices. Because most IoT devices do not support SNMP, we want to implement a SNMP agent that will collect device information and write the collected data to the values of the variables in the MIB. The procedure will be demonstrated on D-Link devices, as a door sensor and signaling device that communicate with the adapter via the Z-Wave radio signal.
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A Tool for Testing VoIP Security
Mazálek, Pavel ; Skokanová, Jana (referee) ; Matoušek, Petr (advisor)
This work is focused on the security of SIP. It describes basic principles of signaling protocol and it outlines the necessary protocols for voice data transfer. It describes some basic attacks on device working with SIP and provides examples and applications. The last chapter is devoted to descrie the program can be used for penetration testing of devices.
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OMNeT++ Extension with ACL Filtering Module
Suchomel, Tomáš ; Ryšavý, Ondřej (referee) ; Matoušek, Petr (advisor)
This bachelor's thesis describes discrete simulation of network in OMNeT++. We are exploring effective representation and evaluation of ACL rules by advanced data structures based on interval decision diagrams. OMNeT++ is extended by filtering properties of packets using access control lists. Because ACL filtering is not supported in OMNeT++, it was added as a brand-new module, whose concept and implementation is described here. Practical usage of the implemented module is demonstrated on a simulation of real nontrivial network. We also analyse results of the simulation and verify them by comparison with real network behaviour.
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