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Hashing + memory = low cost, exact pattern matching

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2 Author(s)
Papadopoulos, G. ; Electron. & Comput. Eng. Dept., Crete Tech. Univ., Greece ; Pnevmatikatos, D.

In this paper we propose the combination of hashing and use of memory to achieve low cost, exact matching of SNORT-like intrusion signatures. The basic idea is to use hashing to generate a distinct address for each candidate pattern, which is stored in memory. Our implementation, hash-mem, uses simple CRC-style polynomials implemented with XOR gates, to achieve low cost hashing of the input patterns. We reduce the sparseness of the memory using an indirection memory that allows a compact storing of the search patterns and use a simple comparator to verify the match. Our implementation uses in the order of 0.15 logic cells per search pattern character, and a few tens of memory blocks, fitting comfortably in small or medium FPGA devices.

Published in:

Field Programmable Logic and Applications, 2005. International Conference on

Date of Conference:

24-26 Aug. 2005

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