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Security of Enterprise VoIP Telephony Networks
Šolc, Jiří ; Pavlíček, Luboš (advisor)
This thesis focuses on enterprise VoIP telephony network security. Introduces brief comparison of old analog and digital voice networks and IP telephone networks with special focus on VoIP system security. The goal of the thesis is to identify the risks of implementation and operation of VoIP technologies in enterprise environment and so thesis brings some conclusion how to minimalize or avoid these risks. First two chapters briefly introduce the development of telephony technologies with differentiation of enterprise telephone network from public telephone networks. Further it describes individual technologies, digitalization of voice, processing the signal and VoIP protocols and components. Third chapter focuses on infrastructure of telephony networks with special interest for architecture of IP telephony and ways of establishing call processing. It describes data flows for further security risk analysis, which this technology came with. Fifth chapter is about enterprise security standards in common and is trying to describe information security management system (ISMS) adopting VoIP technology. Individual security threats and risks are described in sixth chapter, along with known methods how to avoid them. Final parts of thesis concludes of two real situation studies of threats and risks of VoIP technologies implemented in environment of small commercial enterprise and medium size enterprise, in this example represented by University of economics. These chapters conclude theoretical problems shown on practical examples.
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Analysis of security of fire-fighting equipment
Mášová, Jana ; Plášková, Alena (advisor) ; Vratislavský, David (referee)
Thesis analyses security of fire-fighting equipment for firemen. In practical part fire-fighting equipment of one Prague fire station is compared with legislative requirements. Next safety elements are looked for; use, functionality and reliability are specified, moreover their control and servicing are specified too. Finally thesis gives advice to firemen about improving fire-fighting equipment.
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Methods of protection against eavesdropping and snooping in digital networks
Pokorný, Tomáš ; Šalamon, Tomáš (advisor) ; Štorková, Veronika (referee)
The aim of this work is to provide a comprehensive overview of eavesdropping and snooping in digital networks, describe possible threats and show technological and organizational precautions against them. The first chapter introduces the reader into the topic and shows all the main threats. The second chapter describes technological precautions with the emphasis on data flow. The first part of this chapter explains the terminology. Next part tries to solve the security of each type of a communicational channel followed by the virtual private networks issues, physical networks and the risks of encryption. The third chapter analyses organizational issues with the emphasis on legislation. Precautions in this chapter make the technology from the previous chapter more effective. The fourth chapter uses the findings from previous chapters and tries to secure a company in all its complexity. This allows the estimation of total cost. The practical part of this thesis should serve for companies with already developed infrastructure who want a transparent solution that would protect them from eavesdropping and data thefts.
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Analysis of security requirements for payment card industry and problems with their implementation
Klečka, Jakub ; Doucek, Petr (advisor) ; Krob, Jan (referee)
Rapid development of new technologies and their easy implementation introduces new risks that must be faced. This diploma thesis concentrates at payment card industry. Payment card industry come through significant development. Billions of dollar each year flow through these systems. New technologies like contactless cards, prepaid brand cards are emerging, ATM and payment terminal support new services and products. Merchant are looking for new opportunities. This situation brings along new threats and introduces new vulnerabilities. These are not necessarily new, only the whole environment got much more complicated and digger. Unfortunately the acting threats and vulnerabilities were not eliminated. Missing legislation measures and restricted enforceability are not sufficient to effectively fight against crime in this area. On the other hand sever organizations are aware of these threats and tries to face them. New security requirements were introduced for each separate subjects of payment card industry so that the risks are eliminated or their impact is reduced to an acceptable degree. Some of these requirements were already implemented and are in the scope of this work. The goal of this work is to explore these requirements. To find out what risks they are affecting and how effective they are. And in case of need help to implement the appropriate security measure. This work is practically oriented and can help responsible persons to ensure compliance with the requirements and face all effecting threats.
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NATO and the Czech Republic
Svobodová, Tereza ; Veselý, Zdeněk (advisor) ; Dubský, Zbyněk (referee)
The main aim of this thesis is to answer the question how the security of the Czech Republic was solved during the Cold War and after it, with the emphasis on the time period after 1989 and the development of the relationship between the Czech Republic and NATO. Special attention is drawn to the political discussion in the Czech Republic before its accession to NATO in 1999.
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