Dissertation on Firewalls Text

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Showing result 1 5 of 12 swedish dissertations containing the word firewalls. This licentiate thesis is about security in automation networks with emphasis on fieldbus communication. In the process industry, network and system security have become even more important since the introduction of ethernet based fieldbus protocols.

2006, 168 pages 3263368 firewalls are the most critical and widely deployed intrusion prevention systems. A firewall is a security guard placed at the point of entry between a private network and the outside internet such that all incoming and outgoing packets have to pass through it. The function of a firewall is to examine every incoming or outgoing packet and decide whether to accept or discard it. This function is conventionally specified by a sequence of rules, where rules often conflict.

To resolve conflicts, the decision for each packet is the decision of the first rule that the packet matches. Because of the conflicts and order sensitivity of firewall rules, firewalls are difficult to design and analyze correctly. It has been observed that most firewalls on the internet are poorly designed and have many errors in their rules. Towards the goal of correct firewalls, this dissertation focuses on the following two fundamental problems: first, how to design a new firewall such that the errors introduced in the design phase is reduced second, how to analyze an existing firewall such that we can detect errors that have been built in.

For firewall design, we proposed two methods for designing stateless firewalls, namely the method of structured firewall design and the method of diverse firewall design, and a model for specifying stateful firewalls. For firewall analysis, we proposed two methods, namely firewall queries and firewall redundancy detection. The firewall design and analysis methods presented in this dissertation are not limited to just firewalls.

Rather, they are extensible to other rule based systems such as general packet classification systems and ipsec. The information technology dissertation below has been submitted to us by a student in order to help you with your studies. Print reference this reddit this voice over internet protocol voip technology has come of age and is quickly gaining momentum on broadband networks. Voip packetizes phone calls through the same routes used by network and internet traffic and is consequently prone to the same cyber threats that plague data networks today. It presents lower cost and greater flexibility for a venture but presents considerable security challenges.

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Many solutions for voip security are projected, however these solutions should take into account the real time constriction of voice service and their methods be supposed to address probable attacks and overhead related with it. One of these solutions is to make use of firewalls, which implement a security strategy by examining and straining traffic arriving or leaving from a protected network. This is normally done by evaluating an incoming packet to a set of policies and performing the corresponding rule action, which is accept or reject. Undesirably packet examinations can require considerable interruptions on traffic due to the difficulty and size of policies. Consequently, improving firewall performance is significant for the voip networks. In this paper, we propose a new firewall deign that is able to dynamically update firewall policy based on neural network and achieve packet examinations under rising traffic loads, higher traffic speeds, and stringent qos necessities. The design consists of several firewalls configured in parallel that jointly impose a defense strategy.

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