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The Design and Implementation of network behavior monitoring system

Author: LiGuoXin
Tutor: ZhangGuiBin
School: Chinese Geology University (Beijing)
Course: Communication and Information System
Keywords: Content Audit TCP connection control block Text retrieval algorithm
CLC: TP393.07
Type: Master's thesis
Year: 2006
Downloads: 151
Quote: 2
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Abstract


The vigorous development of the Internet on people's lives , work , learning , growing . Bring convenience to people at the same time , it also brings a lot of problems : the hacker acts recklessly Internet , more and more frequent access to destroy various websites ; kind of spread of the virus on the Internet more and more , harm increasingly the greater people keep track of ; illegal speech in violation of the party and state positions in the spread of the Internet , everyone can browse to these illegal information . The existing network monitoring systems are mostly based on the network layer , transport layer , and not be able to monitor the spread of illegal information above in the application layer . Developed based on the application layer of the network monitoring system has become extremely urgent . This paper first discusses the urgency of the development of the contents of the audit system , followed by in-depth analysis of the TCP / IP protocol involved in the development process , on this basis , combined with the objective of the study design reasonable architecture , given the system to achieve the key technologies used in the process . Based the BPF 's LIBPCAP library , efficient packet capture engine to construct reasonable HASH function , HASH algorithm to establish a TCP connection control block , to improve the efficiency of the IP packet tracking and IP packet reassembly algorithm as well as applications such as HTTP, FTP, SMTP layer data reduction, the final text retrieval algorithm improvements Keywords organizations into key tree storage structure , improve the speed of the algorithm to achieve efficient full - text for the system retrieves algorithm.

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