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Web applications and Web services in C#
Vybíral, Petr ; Morský, Ondřej (referee) ; Lattenberg, Ivo (advisor)
This thesis is focused on creating Web applications and services using the programming language C# and the Microsoft development environment Visual Studio 2010. This paper is divided into three chapters. The first one examines the ASP.NET technologies for the development of Web applications and services. It provides insight into the areas currently used in ASP.NET. In addition to this, it presents the development of versions, functions and components of this technology. The second chapter deals with the properties and use of Web services. The instructions for creating simple Web services and services for complex mathematical operations follow. Its functions are used by the console clients and the clients with user interface. The third chapter focuses on the development of a fullWeb application for booking classrooms and laboratories. There is a procedure for creating a database, setting up the project and the use of technology for proper functioning of the applications. At the end of the chapter, using the application supplemented with the screenshots is presented to the user.
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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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Special security system
Náhlík, Ondřej ; Masopust, Jiří (referee) ; Hanus, Stanislav (advisor)
This master’s thesis is focused on design and realisation of special security system for space and property protection. System is devided into two parts, transmitting and receiving. Transmitting part is formed by Raspberry Pi Model B+, motion sensor, webcam and USB LTE modem Huawei E398. Receiving part consists of computer with suitable application for communication with FTP server. Data transfer in mobile systems is described in the first part of this thesis, transmitting part is designed in the second part. There is one transmitting option chosen in the third part and there are also described applications of the transmitting part. The last part of this thesis is focused on the receiving part and its application.
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Verification of PGP digital signatures
Horký, Matyáš ; Burda, Karel (referee) ; Zeman, Václav (advisor)
This bachelor thesis is focused on the interaction of OpenPGP content inside of e-mail files. It describes the history, changes and properties of PGP and e-mail and connects them into a common context. The goal is to design and implement a program for reading and verifying OpenPGP data in electronic mail, which is available as an open-source tool available as both a the command line and as a library.
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Probe for the Application Protocols Monitoring
Fukač, Tomáš ; Košař, Vlastimil (referee) ; Viktorin, Jan (advisor)
This work describes an extension of the Microprobe functionality for detection and filtering of application protocols. The Microprobe is an embedded system designed for monitoring network links at speed 1 Gb/s without loosing any packets. The detection of application protocols requires using of computationally expensive operations, especially string lookup (usually based on regular expressions). Based on the study of several protocols (SMTP, POP3, FTP, SIP) a draft of a new architecture has been created. The new architecture splits this functionality between programmable logic FPGA and processor. The FPGA performs preprocessing of network traffic consisting of a lookup for user identifiers and protocol-specific patterns. The processor verifies that it is the requested communication. The processor does not need to process the entire network traffic but only the part pre-filtered in the FPGA. The software part is extended by a module for the analysis of SMTP which allows processing of more than 5,000 network flows per second. Support for other protocols can be added by an extension of the software part.
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Implementation of multi-purpose server based on WINDOWS
Depiak, Petr ; Kouřil, Jiří (referee) ; Pfeifer, Václav (advisor)
This thesis puts brain to the pieces of knowledge of the network services which are occurred in the server systems. These services are related to data storing, transport and data interpretation. Basically there are transport services which are used by FTP and SMB protocols. These protocols define them generally and their security too. Next section describes principles and application possibilities of electronic mail. It is based on SMTP, POP3 and IMAP protocols. The important part of this thesis is the World Wide Web service exploiting the HTTP protocol. It also refers to creation of dynamic presentation of electronic document by using the MySQL relational database and PHP script language. Practical part goes out of the theoretical part discussed above and all services are implemented on the MS Windows 2003 Server EE R2 platform. The main scope is oriented to the highest usage of data security within the available software. Other part presents the introduction to hosting of the Novell eDirectory service. It is practically applied on the MS Windows platform. This application also includes the administration of eDirecroty service by using the standard tool. This tool allows the administration though the web interface.
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Email Server as a Windows Network Service
Jalůvka, Petr ; Ráb, Jaroslav (referee) ; Očenášek, Pavel (advisor)
Email is one of the most used services on the Internet. It's hard to find a user with less than one own mailbox. These mailboxes are usually located on servers controlled by someone else than mailbox owners. Users trying to create their own email serverhave to install unix system and go through hard configuration process of the email server. Purpose of this work is to familiriaze reader with email history and protocols and then introduce design and implementation of an email server with easy configuration for Windows NT platform.
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System for temperature monitoring in server rooms
Papež, Milan ; Havránek, Zdeněk (referee) ; Macho, Tomáš (advisor)
The aim of this thesis is the design and implementation of a system for temperature monitoring in a server room that is able to send e-mail when exceeding the set temperature value. For this purpose was used PIC18F97J60 microcontroller that includes an Ethernet controller peripheral. Sending e-mail is realized via SMTP protocol, which is included in the TCP/IP stack provided by the manufacturer of the microcontroller. For temperature measurement is used DS18B20 temperature sensors that communicate via the 1-Wire interface. Device also allows the remote conguration. Temperature monitoring was tested using five sensors.
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Detection of Dictionary Attacks on Network Services Using IP Flow Analysis
Činčala, Martin ; Grégr, Matěj (referee) ; Matoušek, Petr (advisor)
Existing research suggests that it is possible to detect dictionary attacks using IP flows. This type of detection was successfully implemented for SSH, LDAP and RDP protocols. To determine whether it is possible to use the same methods of detection for e-mail protocols virtual test environment was created. I deduced the characteristics of attacks in flows from the data, which I gained from this virtual environment. Than I chose the statistical value that separates the attacks from legitimate traffic. Variance of specific flow parameters was chosen as main characteristic of attacks. IP addresses with flows that have small variance of chosen parameters and high frequency of packet arrival are considered untrustworthy. Variance is calculated from IP history to rule out false positives. The IP history of legitimate user contains variation of flows which prevents marking this IP address as dangerous. On the basis of this principal the script, which detects the attacks from the nfdump output, was created. The success of detection of the attacks was tested on classificated data from the real environment. The results of tests showed, that with good configuration of marginal values the percentage of detected attacks is high and there are no false positives. Detection is not limited only on mail protocols. With regard to universal design, the script is able to detect dictionary attacks on SSH, LDAP, SIP, RDP, SQL, telnet and some other attacks.
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Traffic detection and analysis using SSL/TLS
Hutar, Jan ; Dvořák, Jan (referee) ; Smékal, David (advisor)
This diploma thesis deals with a detection and analysis of secure connections of electro- nic communication through SSL/TLS protocols. The thesis begins with introduction to SSL/TLS protocols. Thereafter, an analysis of messages used to establish secure con- nections using STARTTLS and postal protocols SMTP, POP3, and IMAP was made. Metadata detection and extraction of secured simplex and duplex connections take place using deep packet inspection tools. The tool of choice is the nDPI library from the Ntop project. The library was extended to detect the connections and extract the metadata based on studies and analysis of transmitted messages. Finally, testing is performed on a training data set and a basic analysis of acquired metadata is made.
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