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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.
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Accelerated Detection of Network Security Threats
Piecek, Adam ; Kekely, Lukáš (referee) ; Kučera, Jan (advisor)
This bachelor's thesis deals with the acceleration of IDS (Intrusion Detection System) for detection of security threats in networks. The main goal of the thesis is a proposal to use the Software Defined Monitoring (SDM) concept to accelerate the activity of IDS applications with a regard to their subsequent deployment for high-speed network analysis. The proposed system is implemented and subsequently evaluated for two selected open-source applications - Snort and Suricata. Over and above the task, native support for the SZE2 interface for packet acquisition is also implemented for the Suricata system in order to achieve even faster acceleration using an accelerated network interface card. Two alternatives of the concept are further analysed and compared in the thesis. The first alternative uses the hardware-accelerated version of SDM, while the second alternative is based on full software implementation of the SDM principle. Both alternatives are then evaluated in terms of achieved results and performance parameters of the entire system before and after the acceleration.
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Acceleration of Open vSwitch in DPDK
Vodák, David ; Kučera, Jan (referee) ; Martínek, Tomáš (advisor)
Virtual switch is a software that connects virtual machines to the internet, which makes it a crucial part of virtualization on servers. Nevertheless, it can be rather ineffective when it comes to high speed traffic, since it switches all frames in the software. This thesis is about hardware acceleration of the virtual switch called Open vSwitch. The acceleration prototype, which is the goal of this thesis, is based on the RTE flow interface, the SR-IOV standard, and Intel PAC N3000 card. In the scope of this master's thesis, all necessary technologies were described and the acceleration prototype was designed, implemented, and tested. Results of executed measurements indicate increased throughput when rules of the acceleration prototype were offloaded to hardware.
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Libyang - Python 3 Module
Sedlák, David ; Kocnová, Jitka (referee) ; Kučera, Jan (advisor)
This bachelor thesis deals with interaction between C and Python 3 languages. The main goal was to provide user friendly Python 3 binding for libyang2 library which provides interface for C language. Final Python 3 interface is created with help of CFFI package, is simply usable in Python 3 and adequately uses rich features of Python 3 language. Comparison of few approaches and tools to interact with C library from Python code is also covered in the thesis, including measurements of call overhead caused by them. Implemented Python 3 interface will help with integration of YANG modeling language in network applications and devices.
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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.
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Advanced filaments for FDM/FFF 3D printing
Kučera, Jan ; Vespalec, Arnošt (referee) ; Koutecký, Tomáš (advisor)
The bachelor thesis deals with the issue of FDM/FFF 3D printing with a focus on rapidly evolving new filaments and their use in industry. The aim of this work is to display a large number of filaments that have been tested and to categorize them into individual groups for future use. Selected tested materials from scientific studies address both the mechanical properties of individual pure filaments and the effect of additives to these filaments. The analysis of these works then showed that the effect of carbon fiber varies according to the type of base material and the weight percentage of filling. From a practical point of view, the results of this work can be used in the choice of material for printing models and prototypes for own usage.
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Mitigation of DoS Attacks Using Neural Networks
Odehnal, Tomáš ; Wrona, Jan (referee) ; Kučera, Jan (advisor)
This bachelor's thesis deals with design and implementation of two approaches as protection against SYN Flood attacks, which are part of DoS attacks. Nowadays Denial of Service attack are very widespread and their execution are quite simple. While they can cause big financial damage to internet or service providers. The purpose of this work is to determine that conventional algorithmic approach and heuristic approach using neural network are capable of SYN Flood attacks mitigation. Implementation of both approaches were done by their design. Then both implementations were tested.
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Transparent polycrystalline ceramic materials with cubic lattice structure
Kučera, Jan ; Pouchlý, Václav (referee) ; Maca, Karel (advisor)
The presented work is focused on the study of the influence of preparation parameters on the optical properties of polycrystalline cubic ZrO2 (stabilized with 8 mol.% Y2O3). Furthermore, the work deals with the doping of c-ZrO2 with TiO2 and its effect on the luminescence properties of ZrO2. The examined samples were prepared by uniaxial pressing (10 MPa), followed by a cold isostatic pressing (300 and 700 MPa), pressureless sintering (1340–1380 °C, 10 min), and hot isostatic pressing (1200–1400 °C, 4 h, 200 MPa). In this work, it is shown that the optical properties are significantly affected by the temperature of the hot isostatic pressing, the thickness of the sample, and also by the wavelength of the incident light. A maximum real in-line transmission of 68.8 % was achieved, which is 90.5 % of the theoretical limit for c-ZrO2 at an incident radiation wavelength of 632.8 nm. A low-pressure infiltration method and a powder mixing method were used to prepare the doped ZrO2 ceramic sample. With doping, the maximum of the excitation spectrum shifted from 295 nm (4.20 eV) for the undoped ZrO2 to 320 nm (3.87 eV) for the doped samples. Doping led to an increase in emission intensity compared to a pure ZrO2 by up to 23 times. The maximum emission intensity at 545 nm wavelength was achieved for samples doped by infiltration method with a nominal 0.1 mol.% TiO2 content.
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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.
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