National Repository of Grey Literature 167 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Similarity Search in Network Security Alerts
Štoffa, Imrich ; Kučera, Jan (referee) ; Žádník, Martin (advisor)
Network monitoring systems generate a high number of alerts reporting on anomalies and suspicious activity of IP addresses. From a huge number of alerts, only a small fraction is high priority and relevant from human evaluation. The rest is likely to be neglected. Assume that by analyzing large sums of these low priority alerts we can discover valuable information, namely, coordinated IP addresses and type of alerts likely to be correlated. This knowledge improves situational awareness in the field of network monitoring and reflects the requirement of security analysts. They need to have at their disposal proper tools for retrieving contextual information about events on the network, to make informed decisions. To validate the assumption new method is introduced to discover groups of coordinated IP addresses that exhibit temporal correlation in the arrival pattern of their events. The method is evaluated on real-world data from a sharing platform that accumulates 2.2 million alerts per day. The results show, that method indeed detected truly correlated groups of IP addresses.
Environment for Testing of DoS Attack Protection Devices
Tran, Dominik ; Vrána, Roman (referee) ; Kučera, Jan (advisor)
This thesis deals with the development of an environment and necessary set of tests for an evaluation of the DDoS Protector device in terms of functionality and performance. CESNET is developing device called DDoS Protector for protection against denial of service (DDoS) attacks with focus on volumetric and TCP SYN flood attacks. Current development environment does not support generation of stateful (TCP) network traffic and it's difficult to create complex evaluation tests in terms of interaction between various parts of the device. Goal of this work is to create an environment which enables complex evaluation of the device, including generation of both stateful and stateless network traffic combined with multi-vector DDoS attack, thus approaching real network traffic. Cisco TRex was chosen after examination of available traffic generators. Finally set of tests generating various combination of legitimate traffic and attacks was created and DDoS Protector was successfully evaluated.
The analysis of Cu-Sn-Sb ternary alloy
Kučera, Jan ; Doubrava, Marek (referee) ; Jan, Vít (advisor)
This bacholor thesis deals with substituting silver-based material, currently used for experimental semi-liquid extrusion. The proposed material is from the Cu-Sb-Sn system. The theoretical part of the work deals with soldering and phase diagrams. The experimental part is devoted to the analysis of three proposed alloys from the Cu-Sb-Sn system, their structural and mechanical properties. Thermal analyzes of the alloys were performed using differential scanning calorimetry (DSC), the microstructure using a light microscope and a scanning electron microscope, and a hardness tester was also used to determine the hardness. The results are summarized in the discussion.
Protection Against DoS Attacks Using P4 Language
Vojanec, Kamil ; Fukač, Tomáš (referee) ; Kučera, Jan (advisor)
This thesis focuses on reimplementation of existing DoS (Denial of Service) attack mitigation device with high-level P4 programming language. The main reason for using P4 is to enhance adaptability and functionality to different types of DoS attacks. The created device is designed in a modular way and enables easy alterations by using interchangeable components. The target platform for this thesis is an FPGA acceleration card. The work results in designing several DoS mitigation components and implementing applications composed of these components. Pats of this work have been presented at IEEE ANCS (Symposium on Architectures for Networking and Communication Systems) in September 2019 at University of Cambridge.
Technology to remove nitrogen oxides (NOx) from flue gases for large combustion plants
Kučera, Jan ; Brummer, Vladimír (referee) ; Jecha, David (advisor)
This diploma thesis deals with selected abatement techniques of nitrogen oxides (NOx) developed for large combustion plants. The first part describes selected NOx, their properties and explains the formation during combustion. Furthermore, there is an analysis of current legal legislation regulating the issue of emission limits. The third part presents selected primary and secondary measures that are widely used. The emphasis is placed on the description of selective catalytic (SCR) and non-catalytic reduction (SNCR). Finally, the basic design of these technologies for model combustion equipment is performed. The consumption of reducing medium and the volume of the catalyst for the mentioned techniques are calculated here. The estimate of selected operating and investment costs is a part of the basic scheme.
System for the Protection against DoS Attacks Using IDS
Mjasojedov, Igor ; Fukač, Tomáš (referee) ; Kučera, Jan (advisor)
This bachelor's thesis deals with the use of the Intrusion Detection System in the protection of computer networks against Denial of Service attacks. Suricata is the IDS system chosen for this purpose. The main goal of the thesis is to integrate the Suricata system with the DDoS Protector device. DDoS Protector - DCPro is a security network device, which uses, from a software perspective, DPDK technology for high-speed network traffic processing. Due to this fact, this technology was also integrated into the Suricata system. After this integration, the communication between DDoS Protector and Suricata system was allowed more easily. As a result, two DPDK compatible regimes were created in the Suricata system. The individual regime allows Suricata to process network data directly from the network interface card. The second, integrated regime allows DCPro to send network data to the Suricata system for highly precise analysis, which significantly extends DDoS Protector's attack detection abilities.
Mitigation of DDoS Attacks Exploiting Packet Fragmentation
Nešpor, Patrik ; Vrána, Roman (referee) ; Kučera, Jan (advisor)
This bachelor's thesis deals with the development of new mitigation strategies that are designed to suppress DDoS attacks that exploit packet fragmentation. It analyses fragmented traffic primarily emphasizing  the order of fragmented packets. Based on the result of the analysis,  it implements a new heuristic method for port numbers inference. The work also measures the latency and throughput of newly implemented functionalities. All new methods are integrated in a project developed  by the CESNET association.
IP Flow Filtration and Profiling
Sedlák, Michal ; Tisovčík, Peter (referee) ; Kučera, Jan (advisor)
This thesis addresses the problem of filtering and profiling IP flows, primarily data of IPFIXsystems. Within the work, a general filtering component is designed and implemented, whichaims to be sufficiently efficient and flexible for use in other projects related to IP flows. Thiscomponent is then adapted to work with data in the IPFIX protocol format and integratedinto the existing modular collector IPFIXcol2 in the form of plugins adding the support forfiltering of passing IPFIX data and their sorting into profiles.
Employee Attendance System
Bartošek, Jan ; Kučera, Jan (referee) ; Kocnová, Jitka (advisor)
This bachelor's thesis concerns to design and implementation of a time and attendancesystem to track the employees in the company. In the first part defines what does a timeand attendance system mean and presents both statistics data and existing systems. In thenext part aims on designing such a software able to track employees, manage vacation andexport records. Continues with a list of used technologies and implementation of the systemitself. At the end the proccess and results of testing the system are described.
Statistical Modeling of the Risk Indicators in a Company
Kučera, Jan ; Žák, Libor (referee) ; Karpíšek, Zdeněk (advisor)
This diploma thesis deals with the development of individual financial indicators of a selected company using the methods of financial analysis, interval regression analysis and time series analysis. Based on the results of these analyzes there is evaluated the financial situation of the company and created a forecast of the evolution of the selected indicators for the next two years. The selected company is described by an analysis of the internal and external surroundings. Possible risks are identified by a risk analysis and proposals are made to reduce the value of individual risks to an acceptable level.

National Repository of Grey Literature : 167 records found   1 - 10nextend  jump to record:
See also: similar author names
52 KUČERA, Jan
19 KUČERA, Jaroslav
26 KUČERA, Jiří
11 KUČERA, Josef
1 Kučera, J.
9 Kučera, Jakub
1 Kučera, Jaromír
19 Kučera, Jaroslav
26 Kučera, Jiří
3 Kučera, Jonáš
11 Kučera, Josef
3 Kučera, Jáchym
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