Search International and National Patent Collections

1. (WO2010120708) VARIABLE-STRIDE STREAM SEGMENTATION AND MULTI-PATTERN MATCHING

Pub. No.:    WO/2010/120708    International Application No.:    PCT/US2010/030795
Publication Date: Fri Oct 22 01:59:59 CEST 2010 International Filing Date: Wed Apr 14 01:59:59 CEST 2010
IPC: G06K 9/62
H04L 29/06
Applicants: ALCATEL LUCENT
HUA, Nan
LAKSHMAN, Tirunell, V.
SONG, Haoyu
Inventors: HUA, Nan
LAKSHMAN, Tirunell, V.
SONG, Haoyu
Title: VARIABLE-STRIDE STREAM SEGMENTATION AND MULTI-PATTERN MATCHING
Abstract:
A variable-stride multi-pattern matching apparatus segments patterns and input streams into variable-size blocks according to a modified winnowing algorithm. The variable-stride pattern segments are used to determine the block-symbol alphabet for a variable-stride discrete finite automaton (VS-DFA) that is used for detecting the patterns in the input streams. Applications include network-intrusion detection and protection systems, genome matching, and forensics. The modification of the winnowing algorithm includes using special hash values to determine the position of delimiters of the patterns and input streams. The delimiters mark the beginnings and ends of the segments. In various embodiments, the patterns are segmented into head, core, and tail blocks. The approach provides for memory, memory-bandwidth, and processor-cycle efficient, deterministic, high-speed, line-rate pattern matching.