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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 9 of 9 (0.018 seconds)| 1 |
Analysis of the PPTP and IPSec protocols in Virtual Private NetworksTryggvason, Thorir January 2000 (has links)
<p>Today increasing numbers of individuals are working away from the ordinary workplace while still requiring access to the server located at the workplace. New technology is meeting this demand allowing for safe and secure transmission of the data over the Internet. The aim of this project is to analyse two protocols that are used within the Virtual Private Network (VPN) structure today, with the focus on installation, transmission speed on both Local Area Networks (LAN) and via telephone line and security aspects of the protocols.</p><p>The results show that it is quite complicated to setup a VPN network and to get operational. The results also show that there are security compromises within the VPN structure that indicate that if proper precaution is not taken it may give a false sense of security, where the user believes that it is a secure communication when in reality it is not.</p>
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Útoky na bezdrátovou síť / Wireless network attacksBrusnický, Pavel January 2010 (has links)
Objective of this thesis is to point out to almost everywhere present flaw in realization of second level network security access to WiFi networks with using traffic tunneling over DNS protocol. Realization has been accomplished by existing utilities OzymanDNS, DNS2TCP, NSTX, Iodine, Heyoka. Measurements were done on realistic traffic on the network. The effort was to show outline of these implementations. Transfer speeds in some implementations can be marked as applicable thanks to high speeds, which are on the same level as broadband internet. Functionality was tested on WiFi network, where was also compromised PPTP VPN tunnel, its function was to provide security of the communication on wireless network due to absence of first level security mechanisms such as WPA, WPA 2 and so on, with the help of Asleap, which comes out of Cisco LEAP attack. At the end of the work are suggested possible countermeasures for securing network by the topology change of the network infrastructure or by implementing IDS.
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Analysis of the PPTP and IPSec protocols in Virtual Private NetworksTryggvason, Thorir January 2000 (has links)
Today increasing numbers of individuals are working away from the ordinary workplace while still requiring access to the server located at the workplace. New technology is meeting this demand allowing for safe and secure transmission of the data over the Internet. The aim of this project is to analyse two protocols that are used within the Virtual Private Network (VPN) structure today, with the focus on installation, transmission speed on both Local Area Networks (LAN) and via telephone line and security aspects of the protocols. The results show that it is quite complicated to setup a VPN network and to get operational. The results also show that there are security compromises within the VPN structure that indicate that if proper precaution is not taken it may give a false sense of security, where the user believes that it is a secure communication when in reality it is not.
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VPN : Virtual Private Network i Windows 2000Norin, Anders, Ohlsson, Henrik January 2002 (has links)
No description available.
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VPN : Virtual Private Network i Windows 2000Norin, Anders, Ohlsson, Henrik January 2002 (has links)
No description available.
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The Design and Implementation of Packet Filter over Link Layer NIC DriverYu, Pu-Syuan 05 July 2005 (has links)
In this age, the internet has becoming more and more popular recently. How to manage and organize the network effectively is a very important issue.Therefore, the technology of VPN was born. Through the VPN, we can manage and organize the local netork which spread everywhere effectively.But the tunneling technology which VPN used has a security problem. If we also change the VPN¡¦s port number, it will have a big dangerous security problem.
In this paper, we will analyze some basic technology of VPN, and introduce how to modify the VPN. Let VPN have ability to pass through the firewall. This problem will make the people who managed whole network or firewall hard to control and manage it. Another, this paper will bring up the solution which can solve the security problem effectively.
The key of network security problem is to use another protocol¡¦s port number. The solution in this paper will through solve this problem, so hacks can¡¦t modify the TCP port number such as HTTP Port 80 at will.
Our solution is to implement a packet filter which is based on ethernet device driver.We use the RFC document which are defined by IETF to make the packet check rule. This packet filter can reject the illegal packet and make sure the network is safe.
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Implementing a virtual private networkSamuelsson, Joakim, Sandsund, Richard January 2007 (has links)
Dagens företag vill ge anställda möjlighet att jobba hemifrån eller på resande fot. En vanlig lösning för att möjliggöra detta är virtual private network (VPN). VPN ger en användare tillgång till interna resurser på företaget från ett externt nät, exempelvis via Internet. Detta gör att användare kan komma åt de interna resurserna på ett säkert sätt. Vilken VPN-teknik är då att föredra för att få en så snabb, säker och pålitlig anslutning som möjligt? Detta examensarbete tar upp olika VPN-tekniker. Vi beskriver vanliga VPN-protokoll som L2TP, IPSec och PPTP. Hur användare autentiseras på ett säkert och smidigt sätt samt metoder att göra sin VPN-anslutning säker. Vi redovisar också den lösning vi har implementerat hos Confidence, för vilka arbetet utfördes. Problemen med att använda de produkter som redan fanns på företaget beskrivs. Förslag på lösningar ges för att lösa dessa problem i framtida arbeten. / Companies of today want to give their employees the opportunity to work from home or while they travel. A common solution to accomplish this is to implement a VPN over top of the existing network. Using VPN gives the employees access to the company’s local area network from outside, via the internet. The VPN provides a secure channel for these employees to connect to the local services attached to the company’s network that they need to reach. Which VPN technology is most suitable to deliver a secure, fast, and reliable connection to theses employees? In this thesis examines we are taking a closer look at different VPN solutions. We describe different VPN-protocols like L2TP, IPSec and PPTP. How to authenticate users in a secure and flexible way and also methods used to make the VPN-connection secure. Lastly we will show the solution we have implemented at the company Confidence, for whom we made the solution. The difficulties in using existing products with the company’s infrastructure are described. Suggestions are offered for future work to address these problems.
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Vilken mjukvarubaserad fjärranslutningslösning är passande för ett mindre företag?Hurtig, Andreas, Gisslar, Thomas, Karlsson, Alexander January 2009 (has links)
<p> </p><p>Syftet med denna undersökning är att ta reda på vilken mjukvarubaserad fjärranslutningslösning som passar för ett mindre företag, då de har mindre ekonomiska tillgångar än ett större företag behöver de vara mer noggranna med sina produktval. Arbetet är utfört med litteraturstudier och en enkätundersökning till ett tiotal mindre företag, samt en laborationsmiljö där tester av de olika fjärranslutningslösningarnas egenskaper har utförts.</p><p>Område valdes då ämnet fjärranslutning knappt behandlads under utbildningstiden, och fördjupar sig därför inom området.</p><p>Resultatet visar vad mindre företag anser vara de viktigaste egenskaperna med en fjärranslutningslösning. Även de värden som uppkom vid tester i laborationsmiljön kommer att presenteras i resultatet. De samlade resultaten kommer sedan visa på vilken mjukvarubaserad lösning som passar bäst för ett mindre företag.</p><p> </p> / <p><p>The purpose of this survey is to figure out which software based remote access solution that fits a smaller company, hence they have less economy assets than a larger company they need to be more thorough with their products of choice. The work is performed with literature studies and a survey of a dozen smaller companies, and also a laboratory environment where properties of the different remote access solutions are performed.</p><p>This area was chosen because the subject of remote access scarcely was treated during our education, and become engrossed in this area.</p><p>The result shows what the companies consider to be the most important properties with a remote access and also the products results from the tests. Also the values that occurred during testing in a laboratory environment will be presented in the results. The combined results will then show which software-based solution that is best suited for a small company.</p></p>
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Vilken mjukvarubaserad fjärranslutningslösning är passande för ett mindre företag?Hurtig, Andreas, Gisslar, Thomas, Karlsson, Alexander January 2009 (has links)
Syftet med denna undersökning är att ta reda på vilken mjukvarubaserad fjärranslutningslösning som passar för ett mindre företag, då de har mindre ekonomiska tillgångar än ett större företag behöver de vara mer noggranna med sina produktval. Arbetet är utfört med litteraturstudier och en enkätundersökning till ett tiotal mindre företag, samt en laborationsmiljö där tester av de olika fjärranslutningslösningarnas egenskaper har utförts. Område valdes då ämnet fjärranslutning knappt behandlads under utbildningstiden, och fördjupar sig därför inom området. Resultatet visar vad mindre företag anser vara de viktigaste egenskaperna med en fjärranslutningslösning. Även de värden som uppkom vid tester i laborationsmiljön kommer att presenteras i resultatet. De samlade resultaten kommer sedan visa på vilken mjukvarubaserad lösning som passar bäst för ett mindre företag. / The purpose of this survey is to figure out which software based remote access solution that fits a smaller company, hence they have less economy assets than a larger company they need to be more thorough with their products of choice. The work is performed with literature studies and a survey of a dozen smaller companies, and also a laboratory environment where properties of the different remote access solutions are performed. This area was chosen because the subject of remote access scarcely was treated during our education, and become engrossed in this area. The result shows what the companies consider to be the most important properties with a remote access and also the products results from the tests. Also the values that occurred during testing in a laboratory environment will be presented in the results. The combined results will then show which software-based solution that is best suited for a small company.
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