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Possibilities of data communication over LV power lines
Pataj, Jiří ; Zeman, Václav (referee) ; Mišurec, Jiří (advisor)
This thesis deals with possibilities of data communication on low voltage power lines, so-called PLC. This technology allows data transfer on power lines. According frequency band the PLC can be subdivide into narrowband or broadband class.The first part of the thesis deals with theoretical knowledge of data communication on power lines and describes technical solutions. Second part of the thesis deals with narrowband PLC, which is accessible for commercial usage and it is suitable for remote data collection. The last part of the thesis focuses on measuring with device PowerLineDHP-301 made by D-link. The results are real bitrates depending on distance and quality of specific connection.
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Blue Pyramid Building Society, Inc. Financing for the Construction of a Hous
Loučková, Pavla ; Chytilová, Vladimíra (referee) ; Zeman, Václav (advisor)
The object of main master´s thesis called Blue Pyramid Building Society, Inc. – Financing for the Construction of a House occupies by the credits provided from Blue Pyramid Building Society, Inc. The goal of this study is proposing of a Handbook that should help to financial consultants of Blue Pyramid Building Society, Inc. by the process of a loan for financing for the construction of a house (including acquisition of a lot). In the theoretical part I aim at the general principals of the functioning of the building savings and building savings loans. In the practical part I aim at the process of a loan provided from Blue Pyramid Building Society, Inc. There is processed a proposal of the Handwork. In the final part the Handwork is applied to the specific case from practice to assessment of its operation.
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Microelectronic Wireless Networks for Telemetry and Buildings Automation
Šulc, Vladimír ; Sýkora, Jiří (referee) ; Zeman, Václav (referee) ; Kuchta, Radek (advisor)
The thesis deals with a microelectronic wireless networks for telemetry and building automation in terms of energy consumption related to the communication in wireless networks. Assumption, mesh topology is optimal topology for wireless networks for telemetry and building automation, was proven and relation between energy consumption and devices management was shown and functional abstraction related to the energy consumption was described. Several advanced techniques and solutions on physical and network layers were proposed to increase network reliability and decrease power consumption. Proposed techniques can be easily implemented.
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Software for entropy resource evaluation
Šelinga, Martin ; Zeman, Václav (referee) ; Burda, Karel (advisor)
This thesis is focused on exploring the sources of entropy. It includes a description of random number generators and tests used to evaluate entropy quality. Random number generator for Windows and Linux OS was created together with software for entropy evaluation. Subsequently, measurement of entropy was performed on physical workstations and Cloud environments.
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Software support for cryptography system training based on discrete logarithm
Kříž, Jiří ; Zeman, Václav (referee) ; Burda, Karel (advisor)
Current needs of human communication came to status, when most of transferred messages are considered as private and transition over non-secured communication lines in open form is not possible. That originated a lot of different methods for securing of messages and transfers in ciphered form. Two mainstreams were established, symmetric cryptography and asymmetric cryptography. Second of mentioned groups is based on usage of two information – keys, when one of then is broadly known and is public and second, well protected and private. Using a public key it is possible to establish a cryptogram of message, but for deciphering it is necessary to know private key. Asymmetric methods are based on mathematical problems, for which there is not an effective computing algorithm. This thesis are focused for asymmetric cryptosystems based on discrete logarithm problem, where ciphering of message using public key is very easy and quick, but deciphering without knowledge of private key is extremely time consuming process. Work describes a mathematical base of discrete logarithm problem, its’ properties and methods developed for solving of this problem. Descriptions of particular cryptosystems are given, i.e. ElGamal cryptosystem, Diffie-Hellman protocol and DSA. Second part of thesis is focused for web application developed as study support of discrete logarithm problem and of cryptosystems using this problem. It describes functional and graphical interface, work with it and options given to user working with application. Mentions also lessons for user which should help with understanding of described problems and practicing.
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Slow DoS attacks generator
Krivulčík, Andrej ; Zeman, Václav (referee) ; Sikora, Marek (advisor)
The work is focused on Slow DoS attacks and generating them. There are compared 3 most popular web servers and their defensive modules against this type of attacks. Closed are described network model TCP/IP, protocol HTTP (Hypertext Transfer Protocol), each DoS attack, Slow GET, Slow POST or Slow Read and also flood attacks. Afterwards the attack generator is described, with its functionality.
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