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Variable-length hashing for exact pattern matching

Pnevmatikatos Dionysios, Aggelos Arelakis

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URIhttp://purl.tuc.gr/dl/dias/1E733DD1-0B7C-46C5-8F41-FD9DD4D14027-
Identifierhttps://doi.org/10.1109/FPL.2006.311244-
Languageen-
Extent6 pagesen
TitleVariable-length hashing for exact pattern matchingen
CreatorPnevmatikatos Dionysiosen
CreatorΠνευματικατος Διονυσιοςel
CreatorAggelos Arelakisen
PublisherInstitute of Electrical and Electronics Engineersen
Content SummaryHashMem is a memory based, exact pattern matching architecture for Snort-like intrusion detection. It uses CRC- style functions to determine a unique location for a possible match and then matches the input against the pattern stored in the specified memory location. This approach achieves is a very low logic and a reasonable memory cost. In this paper we extend the HashMem architecture to allow storing of variable-length patterns in a single memory structure, reducing the number of required memory structures and comparators. In this way, we improve the density of the memories and reduce the necessary logic for CRC functions and comparators. These improvements allow V-HashMem to accommodate the newest Snort rule-set with modest memory and very low logic cost of about 0.06 logic cells per search pattern character. This logic cost is almost an order of magnitude smaller compared to other research. Variable length HashMem uses single-ported memories, thus allowing the simultaneous processing of two characters per cycle using the FPGA dual ported memories and additional logic. We also extend the V-HashMem architecture to include a header-ID field and support header matching information, a feature missing both from our own earlier work and many related systems.en
Type of ItemΠλήρης Δημοσίευση σε Συνέδριοel
Type of ItemConference Full Paperen
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2015-10-19-
Date of Publication2006-
SubjectAutomatic computersen
SubjectAutomatic data processorsen
SubjectComputer hardwareen
SubjectComputing machines (Computers)en
SubjectElectronic brainsen
SubjectElectronic calculating-machinesen
SubjectElectronic computersen
SubjectHardware, Computeren
Subjectcomputersen
Subjectautomatic computersen
Subjectautomatic data processorsen
Subjectcomputer hardwareen
Subjectcomputing machines computersen
Subjectelectronic brainsen
Subjectelectronic calculating machinesen
Subjectelectronic computersen
Subjecthardware computeren
Bibliographic CitationA. Arelakis , D. Pnevmatikatos, `"Variable-length hashing for exact pattern matching',"in 2006 16th Intern. Conf.on Field Progr. Logic and Applications (FPL), pp. 1-6.doi:10.1109/FPL.2006.311244en

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