1. An Efficient and Scalable Pattern Matching Scheme for Network Security Applications Department of Computer Science and Information Engineering National Cheng Kung University, Taiwan R.O.C. Authors: Tsern-Huei Lee; Nai-Lun Huang Publisher: Computer Communications and Networks, 2008. ICCCN '08. Proceedings of 17th International Conference on 3-7 Aug. 2008 Page(s)1 - 7 Present: Chia-Ming,Chang Date: 3, 4, 2009 1

2. Outline 1. Introduction 2. Architecture 3. Experimental results 4. Conclusion 2

3. Introduction (1/3) 3

4. Introduction (2/3) 4

5. Introduction (3/3) 5

6. Outline 1. Introduction 2. Architecture 3. Experimental results 4. Conclusion 6

7. Architecture (1/3) Σ= {a, b, c, d, e, f, g, h} Σ are sequentially encoded as 0, 1, 2, 3, 4, 5,6 and 7 Y= {abcda (0), abba (1), cda (2), cabc (3)}. 7

8. Architecture (2/3) 8

9. Architecture (3/3) 9

10. Outline 1. Introduction 2. Architecture 3. Experimental results 4. Conclusion 10

11. Experimental results (1/3) 11

12. Experimental results (2/3) 12

13. Experimental results (3/3) 13

14. Outline 1. Introduction 2. Architecture 3. Experimental results 4. Conclusion 14

15. Conclusion (1/1) 15 we first present an idea to improve the throughput performance of the banded-row format AC and then propose a scalable implementation of the Aho-Corasick pattern matching algorithm. our proposed implementation achieves 39.7% reduction in memory requirement for 5,000 pattern strings randomly selected from ClamAV signatures and 16.1% reduction in processing time on the average for scanning various types of files.