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The Research and Implemetation of Stream Filter Technology in Network Security Isolation and Information Exchange System

Author: DingFengXiang
Tutor: ZhangZuo
School: National University of Defense Science and Technology
Course: Computer Science and Technology
Keywords: Flow filtration Isolation exchange State detection Protocol data Content data Netfilter
CLC: TP393.08
Type: Master's thesis
Year: 2007
Downloads: 67
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Abstract


With the extensive application of the Internet , network security issues more and more people's attention . Network security isolation and information exchange technology has become today's network is the most effective means of security and defense . Traditional network security isolation and information exchange technologies , including packet filtering technology and agent technology . Simple packet filtering technology to achieve high performance of network processing , but the lack of protection for the application layer . Agent technology provides the ability to protect the application layer , but the performance of the network processing can not meet the growing demand for network users . How to adjust the safety performance and processing performance irreconcilable contradictions are increasingly pay attention . Flow filtration technology came into being , it combines the advantages of packet filtering technology and agent technology to provide protection to the application layer packet filtering external morphology . This article the convection filter technology carried out in-depth research . Thesis on network security isolation and information exchange technology carried out in-depth research , summed up the general architecture of the system in isolation exchange , analysis of the characteristics of the packet filtering technology and agent technology , and to clarify the advantages of flow filtration technology . Secondly , in-depth analysis of the problems of flow filtration thinking and existing implementations flow filtration technology on the basis of in-depth study of the TCP / IP protocol and application layer protocol characteristics , the key point is that : on the basis of the state detection of TCP packet classification processing . TCP packets based on the key points , divided into application and application-independent two categories , which is divided into application message protocol data packets and content of data packets two categories . The flow filter packets of the different types of security checks at different depths . Flow filtration to achieve the key algorithm . Proposed check the legality and the rule matching algorithm optimized for state detection ; proposed session state detection algorithm for the processing of the protocol data packets ; implementation algorithm of the proposed restructuring and forwarded for processing message content data into blocks . Finally, the design and implementation of a stream filter function modules based on the Linux netfilter framework , through functional testing and performance testing and validation flow filtration technology advantages in safety performance and processing performance . In the final the next step was expected.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Computer network > General issues > Computer Network Security
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