|
|
Peer-to-peer network for newspaper publication
Medvecký, Michal ; Bednárek, David (advisor) ; Zavoral, Filip (referee)
Easy, simple and free as in freedom. These are the requirements for ev- eryday access to information in newspapers. In this thesis we will create such environment based on network. We are designing a protocol for com- munication between peers, with messages being encrypted and with article verification upon download. Protocol ensures operation of newspaper as an institution with support for journalists and article publication. After an ar- ticle is downloaded by the reader, it becomes available for further sharing inside the network. With readers and newspaper being the only sources of articles, we ensure protection of information inside the network.
|
|
|
Fast hash-based signing protocol for message stream authentication
Mejzlík, František ; Zavoral, Filip (advisor) ; Kofroň, Jan (referee)
Security of the data streaming over Internet becomes a challenge if re- quirements such as post-quantum-capable cryptography and complete de- centralisation must be addressed. This thesis develops a connection-less, re-broadcastable data streaming protocol that allows a wholly decentralised, petname-based quantum-robust authentication of streaming sources based solely on the post-quantum hash-based few-time signature schemes. As the main contribution, the thesis benchmarks various trade-offs given by the problematic ephemeral nature of identities based on the few-time signature schemes and by the desired networking properties of the streaming proto- col. The benchmarks show that the schemes are practically extensible to realistic use cases, with only minor overhead. The proof-of-concept proto- col implementation is provided as a Rust library, together with the example application for live audio broadcasting. 1
|
|
|
Convergent Real-Time Collaborative Document Editor and Repository
Kloda, Vojtěch ; Kruliš, Martin (advisor) ; Zavoral, Filip (referee)
Online document editors are useful tools that allow users to create, edit, and often also store and share documents. Some editors additionally support collaborative real-time editing for multiple users, allowing them to get live feedback from others. Collaborative editors need to face the issue of conflicting user changes. To avoid desynchronization, such editors need to be able to resolve conflicts in a consistent way at the site of each user. To do so, editors use the technology of operational transformation, which proposes a series of complex algorithms aiming to achieve consistency. The goal of this thesis is to develop a collaborative editor and repository prototype which is able to automatically resolve conflicting user changes and support large numbers of active users. To achieve this, a new theory for handling consistency is devised from an existing one by introducing a set of constraints to improve scalability. 1
|
|
|
Portfolio performance evaluation
Simonov, Dmitry ; Zavoral, Filip (advisor) ; Peška, Ladislav (referee)
The goal of this work is to develop a tool for tracking and analysis of investment portfolios, with support for automatic financial data retrieval and highly customizable chart creation. In this thesis, we research existing investment tracking tools, comparing them based on their supported features. We also analyze different methodologies of eval- uating performance of an investment. Following this, we develop a web application using ASP.NET and React.js allowing the user to import, track, and chart their investments. Financial data for tracked securities is automatically fetched from various data sources using a handcrafted library, which can be used for retrieval of any kind of data from dif- ferent sources, while supporting easy addition or replacement of such sources. Finally, we evaluate the implemented application and suggest possible extensions and improvements. 1
|
|
|
Portfolio performance evaluation
Kočandrle, Vojtěch ; Zavoral, Filip (advisor) ; Kliber, Filip (referee)
Many people invest their money in various assets in order to produce gain. Therefore, they need to monitor how their investments are doing. There are specialized applications for this purpose. However, most of the existing solutions contains only a limited amount of features, especially when it comes to displaying graphs. Users also usually can not decide where data is stored and retrieved from. In out work, we will therefore focus on creating a competitive application that will be expandable using plugins and at the same time simple to use with possiblity of creating graphs and their user-definined layout within the dashboard. The simplicity of the application will also mean that, despite its extensibility, there will be no need to edit any configuration files. All settings will be configurable directly from the graphical user interface. 1
|
|
|
Peer-to-peer network for newspaper publication
Medvecký, Michal ; Bednárek, David (advisor) ; Zavoral, Filip (referee)
Easy, simple and free as in freedom. These are the requirements for ev- eryday access to information in newspapers. In this thesis we will create such environment based on network. We are designing a protocol for com- munication between peers, with messages being encrypted and with article verification upon download. Protocol ensures operation of newspaper as an institution with support for journalists and article publication. After an ar- ticle is downloaded by the reader, it becomes available for further sharing inside the network. With readers and newspaper being the only sources of articles, we ensure protection of information inside the network.
|
|
|
Augmented-reality Multiplayer Game
Čermák, Michal ; Zavoral, Filip (advisor) ; Forst, Libor (referee)
With the advent of COVID-19, there have sprung up phone applications that track the contacts of its users. A bad accuracy of location-based proximity at close range, especially indoors, drove developers to look for other means of obtaining the device proximity. Bluetooth came as a logical pick as all phones have it. In this thesis, we have created a phone framework that uses GPS and Bluetooth to acquire accurate proximity of its players. The proximity retrieval and common server functionality have been encapsulated into a general-purpose library that is used in the implementation of a simple augmented reality game. We have conducted experiments on the game showing how Bluetooth-based and GPS-based proximity behaves. Then we have discussed when to choose one over the other. 1
|
|
|
Precise and Efficient Incremental Update of Data Lineage Graph
Kumstýř, Josef ; Parízek, Pavel (advisor) ; Zavoral, Filip (referee)
Data lineage forms an essential aspect of today's enterprise environment. MANTA Flow is a data lineage analysis platform that works based on extracting and analyzing customers' source files. However, often the customer wants to update the data lineage graph because of a slight change in provided source files. However, all of the input source files are currently reanalyzed, and most of the time is wasted analyzing unchanged files. In the thesis, we presented how the data lineage analyzer can be improved using incremental updates to analyze only a fraction of all input files while still producing the same correct data lineage. We changed how the whole analysis is done by changing the granularity of the anal- ysis to much smaller pieces. We also improved the merge algorithm to recognize when an unchanged file could generate a different data lineage using new concepts like source segments, node removal, or node creation. The new MANTA client algorithm now ana- lyzes only changed files and a few unchanged files that could generate a different lineage compared to the last analysis. We also implemented a prototype for the MANTA Oracle scanner that contains these new ideas. It was tested for both the correctness and the performance. 1
|
|
|
Framework for distributed monitoring of services
Skotáková, Lenka ; Děcký, Martin (advisor) ; Zavoral, Filip (referee)
Title: Framework for distributed monitoring of services Author: Lenka Skotáková Department: Department of Software Engineering Supervisor: Mgr. Martin Děcký, Department of Distributed and Dependable Systems Supervisor's e-mail address: martin.decky@d3s.mff.cuni.cz Abstract: Monitoring of servers and its services enables early detection of problems.Distributed monitoring provides the advantage of load balancing between multiple nodes. Most of the tools providing distributed monitoring still retain the master node as a single point of failure. Distributed system working without a central node is more reliable. Redundancy of monitoring can be also introduced for further increase of reliability. Then it is appropriate to ensure that reports of failures do not repeat. This thesis presents a distributed system for monitoring of services, resistant to failure of nodes including a node that currently acts as a coordinator. Nodes automatically distribute tasks among themselves and found problems are collected and stored so that the notifications are not repeated. Keywords: distributed systems, distributed monitoring, network services, Invitation algorithm
|
|
|
Information system for educational agencies
Marván, Tomáš ; Bednárek, David (advisor) ; Zavoral, Filip (referee)
The goal of this work is to implement an internet and intranet information system for registering lectors and students in an educational agency, together with their abilities, requirements, time possibilities etc. The system allows all the administrator, lectors and students to enter data. The entered data are liable to validation by the administrator. The system is able to partly automate administrator's tasks within pairing of lectors and students according to the entered information.
|
guest ::
