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Security risks of social networks and their prevention
Nguyen, Sao Linh ; Koch, Miloš (referee) ; Sedlák, Petr (advisor)
This diploma thesis deals with the issue of security risks and threats of social networks. The work includes basic information about the most popular online social networks such as Facebook, Twitter and Instagram. The work analyzes the development and use of the above mentioned networks. In addition, there are the risks and dangers of communicating on social networks and recommendations for safe use.
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Analýza způsobů informační bezpečnosti pro uživatele internetu
Vladimirova, Ekaterina ; Luc, Ladislav (advisor) ; Novotný, Jakub (referee)
This thesis is devoted to the information security risk analysis methods for Internet users. Its main objectives include familiarizing Internet users with the types of Internet security threats, analyzing the most prominent anti-virus software, giving instructions for installing a Windows firewall, and providing recommendations on information security. The theoretical part describes the main and most popular services offered on the Internet, as well as the history and development of the Internet. Other chapters focus on information security and describe the types of malware threats that might be encountered on the Internet. In the conclusion of the theoretical part the means of protection against cybercrime, i.e. anti-virus programs and firewalls are characterized. The practical part consists of three parts. The first part is devoted to the evaluation of seven popular antivirus programs with their own firewall in accordance with the selected criteria. The second part gives instructions on how to configure Windows 8 Firewall. Finally, recommendations for Internet users are provided, which must be observed for their own safety.
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Organization protection against malware design
Vykydal, Tomáš ; Vykydal, Miloslav (referee) ; Ondrák, Viktor (advisor)
The object of this bachelor work is to design a solution for places, where any imperfection were found.in an analysis of the current state of malware protection in a monitored company. solutions are designed for individual places, where any Result of this work is a design, which significantly increases the level of protection against malware and a description of the current situation in the problematics of malware and protection against it.
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Proxy servers in Internet
Henek, Jan ; Burda, Karel (referee) ; Komosný, Dan (advisor)
The goal of this paper is to analyze the representation of proxy servers in cyber attacks conducted by Internet. For this purpose I used method which compares tested IP address with database of open proxy servers. I assembled a list of IP address taken from the blacklist of cyber attacks committed in 2015. Then I checked this list with the created program Proxy checker and compared them with a database of open proxy servers. By measurement I demonstrate the inefficacy of this method for reverse detection of proxy servers in the IP list of past attacks.
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Implementation of General Discussion Group
Novotný, Vladimír ; Rychnovský, Lukáš (referee) ; Lukáš, Roman (advisor)
This thesis follows discussion forum's problems. This thesis wants to find a new view on various discussions on the internet. There is also a will to fight against spam. For this purpose is built in analyze system for new contributions. The main object of this thesis is to create an universal internet discussion forum which meets all formal requirements.
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Email Communication Problematics
Tlusťák, Karel ; Pecho, Peter (referee) ; Malinka, Kamil (advisor)
This work describes actual problems regarding to email communication. It shows how emails technically work and on these bases describes today's possibilities of email authentication. Next to it, the paper focuses on the biggest problems connected to emails - spamming and phishing. As far as spam is concerned, this work is dealing with methods of detection and filtering spam. Phishing is demonstratively shown on virtual case of phish-attack and attention is paid to anti-phishing tools as well. Other key-part of this work is low view of email problematic. This part covers judgement and eventual punishment of spamming and phishing in accordance to Czech, European Union and other countries' legislation. The phishing, considered to be the most serious problem concerning to emails, is demonstrated by the virtual court case which shows how related organs works and what are the problems about it. Some precedential cases are discussed there as well. The last part of this work describes the implementation of simple program which uses database in the Phishtank server to analyse phishing emails.
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Preserving Validity of MS Exchange Headers on Filtering SMTP Proxy-Server
Szabó, Peter ; Židek, Stanislav (referee) ; Richter, Jan (advisor)
The aim of this thesis is the localization and finding an optimal solution for a compatibility issue between two products, the AVG Linux Server Edition SMTP proxy-server and the Microsoft Exchange e-mail server. There are several possible solutions of this issue described and the most effective one is suggested as the final solution. In the first part, this thesis is providing a basic overview of the SMTP protocol and the protocols used in the Microsoft Exchanage server. The most common threats in the e-mail communication are also discussed here and several available solutions of protection against them are presented.
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Network Protection Using NetFlow Data
Sedlář, Petr ; Žádník, Martin (referee) ; Tobola, Jiří (advisor)
This document provides information about Cisco NetFlow technology and its usage to protect networks from different types of attacks. Part of the document is a summary of common security risks in term of their detection on network and transport layer. There are specified characteristics of NetFlow data containing samples of security risks. On the basis of these characteristics, an application for detection these risks is designed and implemented.
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Artificial Immune Systems for Spam Detection
Hohn, Michal ; Sekanina, Lukáš (referee) ; Schwarz, Josef (advisor)
This work deals with creating a hybrid system based on the aggregation of artificial immune system with appropriate heuristics to make the most effective spam detection. This work describes the main principles of biological and artificial immune system and conventional techniques to detect spam including several classifiers. The developed system is tested using well known database corpuses and a comparison of the final experiments is made.
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Spam Filter Implementation on the Basis of Artificial Immune Systems
Neuwirth, David ; Schwarz, Josef (referee) ; Sekanina, Lukáš (advisor)
Unsolicited e-mails generally present a major problem within the e-mail communication nowadays. There exist several methods that can detect spam and distinguish it from the requested messages. The theoretical part of the masters thesis introduces the ways of detecting unsolicited messages by using artificial immune systems. It presents and subsequently analyses several methods of the artificial immune systems that can assist in the fight against spam. The practical part of the masters thesis deals with the implementation of a spam filter on the basis of the artificial immune systems. The project ends with comparison of effectiveness of the newly designed spam filter and the one which uses common methods for spam detection.
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