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Lattice-based Threshold Signature Optimization for RAM Constrained Devices
Shapoval, Vladyslav ; Ricci, Sara
The DS2 scheme is a lattice-based (n, n)-threshold signature based on the standardized Dilithium signature. However, deploying DS2, as well as Dilithium, on microcontrollers is a challenge due to the memory limitations of these devices. While the decryption phase can be implemented relatively straightforwardly, the key generation and signing phases require the generation and manipulation of large matrices and vectors, which can quickly exhaust the available memory on the microcontroller. In this paper, we propose an optimization of the DS2 key generation and signing algorithms tailored for microcontrollers. Our approach focuses on minimizing memory consumption by generating large elements, such as the commitment key ck and the random commitment parameter r, on the fly from random and non-random seeds. This approach significantly reduces the overall size of the signature from 143 KB to less than 5 KB, depending on the number of signers involved. We also split the algorithms into two distinct components: a security-critical part and a non-security-critical part. The security-critical part contains operations that require secret knowledge and must be run on the microcontroller itself. Conversely, the non-critical part contains operations that do not require secret knowledge and can be performed on a connected, more powerful central host.
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Mapping and analyzing of signal coverage of 4G/5G mobile networks
Baránek, Michal ; Polák, Ladislav ; Kufa, Jan
This paper addresses the enhanced measurement of signal coverage, capacity, and reliability in mobile networks, particularly with the growing prevalence of 4G and 5G technologies. Given the escalating importance of these networks in everyday activities, there arises a demand for open-source solutions to evaluate and enhance their performance effectively. The objective of this research is to analyze gathered data to pinpoint areas necessitating network enhancements and to develop opensource software and hardware solutions for extracting essential performance metrics (KPIs) from 4G/5G networks. The proposed system offers an interface for assessing network performance and signal coverage, enabling cost-efficient measurements across diverse environments.
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Application of Optimization Algorithms to Support Penetration Testing
Žáček, Dominik ; Lazarov, Willi
This paper presents a novel approach to support the pre-engagement phase of penetration testing, where testing tasks are assigned to penetration testers based on their knowledge and experience to ensure the most appropriate selection. To apply and verify our approach, we developed an automated tool that uses optimization algorithms for the task assignment process. Experimental testing shows that the application of algorithms based on optimization problems in the first phase of penetration testing could be a way to increase its effectiveness.
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Automatic production line efficiency evaluation and optimization
Štěrba, Zdeněk ; Kaczmarczyk, Václav
The article deals with the analysis of the production line in terms of overall efficiency. The aim is to define the areas that play a role in overall efficiency and then devise appropriate solutions to improve them. Emphasis is placed on the analytical method Basic MOST designed for work norming, according to which the normalized time of operators is determined. The next part of the paper is devoted to the analysis in order to find the weak points of the line that could be optimized in order to increase efficiency or financial savings. The production line and its analysis is also processed as a discrete event system in Siemens Plant Simulation software, focusing on the data flow and variability of the whole system.
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Synthesis of amides of 3,4-benzotropolone-carboxylic acid
Panýrková, Gabriela ; Machara, Aleš (advisor) ; Rýček, Lukáš (referee)
Tropolone and benzotropolone are both naturally occurring motifes with broad spectrum of bioactivities and interesting properities that are connected to these structures. This bachelor thesis explores preparation of 3,4,6-trihydroxy-5H-benzo[7]annulen-5-one, so called purpurogallin and it's possible preparation by enzyme catalyzed reactions and further synthetic use of these products. The study is mainly focused on synthesis of 3,4-benzotropolon- carboxylic acid, specially it's amides. First part deals with choosing the optimal reaction conditions for formation of these amides. In the next part palladium catalyzed carboxylations were performed on prepared bromoderivate of dehydroxypurpurogallin. Key words tropolones, benzotropolones, dehydroxypurpurogallin-4-carboxylic acid, amides, optimization, enzymatic catalysis, carboxylation
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Optimalizace systému Suricata zredukovaním mezivláknových závislostí
Kríž, Adam ; Setinský, Jiří (referee) ; Šišmiš, Lukáš (advisor)
In the age of the internet, connection to the global network is possible from almost any type of device. Just to name a few: a fridge, a front door, a smart watches and more. With the growing number of devices that require an internet connection, the security and protection of the user's privacy comes to the foreground. One of the solutions that can be ensured network protection is Suricata, which is used to detect network threats and events. It can deploy as a monitoring system or it can be an active prevention system. Aim of this work will be optimizing the Suricata system in IDS mode (Intrusion Detection System ). As a result of the work, certain data structures will be changed, which will reduce cross-thread dependencies. The result will be an expected increase in performance in the form of savings processor time and increasing the volume of processed packets at the same time. Achieved results will be described in detail and evaluated at the end of the bachelor's thesis.
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Process model of the switchgear laboratory
Paloš, Radek ; Bušov, Bohuslav (referee) ; Šimek, David (advisor)
This thesis deals with the issue of process optimization. Especially with two selected methods, Lean six sigma and TRIZ. Both of these methods are briefly described, especially we could find in this thesis chapters about history, options of usage, and description of selected tools for realization. The thesis also deals with the comparison between methods, including their advantages and disadvantages. The next part of the thesis is about process mapping of preparation before testing electrical devices in the UVEE department FEEC laboratory, which is part of BUT. Except process map, there is an analysis of each process, evaluation, and future possible optimization.
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Registration of retinal image data using evolutionary algorithms
Matoušek, Šimon ; Mézl, Martin (referee) ; Odstrčilík, Jan (advisor)
This thesis deals with the registration of retinal images. Firstly, the introductory chapter summarizes the theory related to evolutionary algorithms and their practical application in the form of a literature search, then different approaches of retinal image registration and image transformation are described. At the same time, the anatomy of the eye as a key organ for visual perception is briefly introduced. In the practical part of the thesis, the method of registration of static and then dynamic retinal images is implemented using MATLAB software environment, and finally the results of different approaches are compared.
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Optimizing the line-up of a sports team in a sallary capped league
Sabo, Adam ; Popela, Pavel (referee) ; Hrabec, Pavel (advisor)
This thesis is focused on the optimization of the lineup of a professional sports team operating under a salary cap condition. In the first part of the thesis, the theoretical foundations necessary for a proper understanding of the issue are introduced. Further, mathematical statistics and optimization methods are explained here and used in data analysis and in the creation of the relevant model. Particular emphasis is put on the methods of principal component analysis and linear programming. In the second part of the thesis, the problem of the optimization task, which takes into account the relevant NHL rules of competition and the salary cap together with performance characteristics of players, is formulated. The formulation was used to develop an optimization model that simulates real conditions in the NHL. This section also presents the application of the model based on historical data. Results obtained from calculations using the Python programming language are presented in the form of graphs, tables, and commentaries, showcasing the optimal team lineups, their characteristics, and respective rankings.
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