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Memory Efficient Regular Expression Pattern Matching Architecture For Network Intrusion Detection Systems

Electronic Theses of Indian Institute of Science

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Field Value
 
Title Memory Efficient Regular Expression Pattern Matching Architecture For Network Intrusion Detection Systems
 
Creator Kumar, Pawan
 
Subject Access Control (Computer Networks)
Cryptography
Network Intrusion Detection System
Computer Security
Cyber-attack
Network Intrusion Detection - Regular Expression Pattern Matching
Cascaded Automata Architecture
Deterministic Finite Automata
Network Intrusion Detection - Memory Efficient Algorithms
Network Intrustion Detection System Signatures
Network Intrusion Detection Systems (NIDS)
Modified Word-based NFA (M-WNFA)
Network Security
Pattern Matching
Computer Science
 
Description The rampant growth of the Internet has been coupled with an equivalent growth in cyber crime over the Internet. With our increased reliance on the Internet for commerce, social networking, information acquisition, and information exchange, intruders have found financial, political, and military motives for their actions. Network Intrusion Detection Systems (NIDSs) intercept the traffic at an organization’s periphery and try to detect intrusion attempts. Signature-based NIDSs compare the packet to a signature database consisting of known attacks and malicious packet fingerprints. The signatures use regular expressions to model these intrusion activities.
This thesis presents a memory efficient pattern matching system for the class of regular expressions appearing frequently in the NIDS signatures. Proposed Cascaded Automata Architecture is based on two stage automata. The first stage recognizes the sub-strings and character classes present in the regular expression. The second stage consumes symbol generated by the first stage upon receiving input traffic symbols. The basic idea is to utilize the research done on string matching problem for regular expression pattern matching. We formally model the class of regular expressions mostly found in NIDS signatures. The challenges involved in using string matching algorithms for regular expression matching has been presented. We introduce length-bound transitions, counter-based states, and associated counter arrays in the second stage automata to address these challenges. The system uses length information along with counter arrays to keep track of overlapped sub-strings and character class based transition. We present efficient implementation techniques for counter arrays. The evaluation of the architecture on practical expressions from Snort rule set showed compression in number of states between 50% to 85%. Because of its smaller memory footprint, our solution is suitable for both software based implementations on network chips as well as FPGA based designs.
 
Contributor Balakrishnan, N
Singh, Virendra
 
Date 2014-06-05T07:13:39Z
2014-06-05T07:13:39Z
2014-06-05
2012-08
 
Type Thesis
 
Identifier http://etd.iisc.ernet.in/handle/2005/2321
http://etd.ncsi.iisc.ernet.in/abstracts/2985/G25266-Abs.pdf
 
Language en_US
 
Relation G25266