GBF: a grammar based filter for internet applications

  • Authors:
  • M. Zaki;M. G. Darwish;G. Osman

  • Affiliations:
  • Department of Computer and Systems, Faculty of Engineering, Al-Azhar University, Nasr City, Cairo, Egypt;Faculty of Computer and Information, Cairo University, Cairo, Egypt;Research Developing Center (RDC), Cairo, Egypt

  • Venue:
  • Journal of Network and Computer Applications
  • Year:
  • 2003

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Abstract

Observing network traffic is necessary for achieving different purposes such as system performance, network debugging and/or information security. Observations, as such, are obtained from low-level monitors that may record a large volume of relevant and irrelevant events. Thus adequate filters are needed to pass interesting information only.This work presents a multilayer system, GBF that integrates both packet (low-level) and document (high-level) filters. Actually, the design of GBF is grammar-based so that it relies upon a set of context-free grammars to carry out various processes, specially the document reconstruction process. GBF consists of three layers, acquisition layer, packet filter layer, and reconstruction layer. The performance of the reconstruction process is evaluated in terms of the time consumed during service separation and session separation tasks.