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Stress testing of email communication
Takács, Peter ; Sikora, Marek (referee) ; Člupek, Vlastimil (advisor)
Táto práca sa zaoberá vylepšením SMTP a Mail Reader Samplerov pre JMeter, ktoré umožňujú výber konkrétnych sieťových rozhraní, podporu IPv6 a možnosť testovania pomocou viacerých zdrojových IP adries a portov a vývojom nového modulu, ktorý dokáže spúšťať a zastavovať služby e-mailového servera. Teoretická časť sa zameriava na protokoly používané v e-mailovej komunikácii vrátane protokolov SMTP, IMAP a POP3 a na funkčnosť testovania výkonnosti. Praktická časť sa zameriava najmä na vylepšenie vzorkovača SMTP, vzorkovača čítačky pošty a vývoj nového modulu emulátora e-mailového servera. Testuje sa v nej aj funkčnosť a vplyv nových funkcií a modulov. Výsledky týchto testov sú analyzované na konci tejto práce.
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Monitoring system of network nodes for stress testing
Svozil, Jiří ; Člupek, Vlastimil (referee) ; Sikora, Marek (advisor)
This thesis is focused on the design, implementation and testing of a system specifically designed for the collection, storage and transmission of server data. The aim of this system is to provide users with a simple and efficient means of monitoring and storing essential server information, which can later be transmitted for further use. The work deals with the design and creation of software for collection, transmission and storage of the measured data.
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JMeter module for HTTP/2 protocol testing
Smetana, Martin ; Člupek, Vlastimil (referee) ; Jurek, Michael (advisor)
The bachelor thesis deals with communication protocols and describes Slow DoS and DDoS attacks in a comprehensive way. It deals with HTTP/2 protocol, description of its frames and used HPACK header compression. It also deals with creating Slow DoS attacks in JMeter, configuring the server to support HTTP/2 protocol and then testing the created modules on Apache server version 2.4.52.
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Implementation of server services in stress tester
Berg, František ; Frolka, Jakub (referee) ; Člupek, Vlastimil (advisor)
This bachelor thesis deals with the analysis and implementation of DNS, DHCP and NTP server services into a stress tester developed at the Institute of Telecommunications. All services are implemented in the Ubuntu Linux distribution through the software packages bind9, isc-dhcp-server and ntp. A graphical interface has been created for all services that can be used to start and stop the services. It is also possible to define the version 4 and 6 IP address, port and network interface on which the service listens. All services use the newly created configuration files for their operation using the Server Emulator module, while the original configuration is retained. This article describes the theoretical basis of the selected server services and then the
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Advanced security for blockchain transactions
Tran, Minh ; Člupek, Vlastimil (referee) ; Dzurenda, Petr (advisor)
Blockchain technology, especially Bitcoin, has revolutionized how we think about and manage financial transactions. However, with the increasing demand and usage of blockchain technology, the security of cryptocurrency wallets has become a critical concern. Threshold signatures offer a promising solution to this problem, allowing multiple parties to sign a transaction without revealing their private keys. This article presents an Android mobile Bitcoin wallet application that uses Schnorr-based threshold signatures. The application also deploys smartwatch integration for enhanced security and usability. This integration provides an additional layer of security by requiring physical confirmation from the user before approving any transaction. Our implementation provides a secure and efficient platform for managing Bitcoin assets using threshold signatures while also providing an intuitive and easy-to-use interface for interacting with the application.
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ICT tester
Tatar, Martin ; Člupek, Vlastimil (referee) ; Zeman, Václav (advisor)
The diploma thesis deals with the extension of the ICT Tester plugin module which allows the user to digitally sign the generated outputs and with the testing of selected DoS attacks that are implemented in it. In the theoretical part of the thesis, selected types of DoS attacks are analyzed, it is described how they work, how to defend against them, examples of significant attacks that actually took place are included and Apache JMeter is described. In the practical part selected attacks are created and tested. Then the new funcionality for digital signature is implemented.
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Ensuring Long-term Data Integrity in Cloud Storage
Nohava, Martin ; Člupek, Vlastimil (referee) ; Malina, Lukáš (advisor)
The subject of the thesis is the design and development of a system to ensure the long-term integrity of data from the Nextcloud cloud storage, which manages and stores electronic evidence. In the introductory part, the terms and principles used for securing data integrity are presented, including quantum-resistant digital signature schemes. Subsequently, the architecture of the archiving system and the method of its connection with the Nextcloud cloud storage are proposed. The resulting system consists of two main components, the Archive application, which extends the web interface of the Nextcloud instance, and the archiving system, which ensures the integrity of the archived files themselves. In addition to time stamps, system also uses a quantum-resistant Dilithium signature scheme. At the end of the work, an evaluation of the implemented solution is carried out by measuring the performance of the archiving system, and options for its further development are proposed.
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Integration and automation of deployment of updated load testing modules
Jedlička, Jakub ; Člupek, Vlastimil (referee) ; Šeda, Pavel (advisor)
This thesis focuses on performance testing using JMeter and developing modules for denial of service (DoS) attacks. The thesis first deals with the theory, where performance testing is described, the tools used for this type of testing and finally the types of DoS attacks. The practical part starts with the migration of the operating system of the load tester on which the testing was performed. It also describes the upgrade of the JMeter tool from version 4.0 to version 5.5, updating the custom add-on modules and fixing bugs in modules so that the modules can be used without errors with the JMeter tool in version 5.5. The updated JMeter tool and custom add-on modules are uploaded to the load tester. For future updates, automation scripts are created to update the system packages of the load tester, updating both the custom add-on modules and the JMeter tool. The module extensions that have been made to increase the scope of the tests are then discussed. These extensions add mainly link layer parameters and support for IPv6. The final section describes the newly created parts of the DDoS module. The new parts of the module extend the capabilities of testing web applications using multiple IP addresses or testing using slow attacks.
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Random number generator using wireless networks
Frolka, Jan ; Dvořák, Jan (referee) ; Člupek, Vlastimil (advisor)
This master's thesis introduces the reader to the types of random number generators and the possibilities of their implementation. The methods of testing random numbers and different types of statistical test sets are described. The thesis includes the design and implementation of a custom random number generator using wireless networks. The value of the signal strength multiplied by the difference in time since the previous packet was received is used as the source of randomness. The generator is controlled by a web application that allows the user to generate, store and test random numbers using the NIST STS test suite. The generated sequences from the generator were further tested using the ENT suite. The results are further compared with the generator using atmospheric noise from the website.
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