1. Intelligent Database Systems Lab Presenter : YAN-SHOU SIE Authors : E.J. Palomo, J. North, D. Elizondo, R.M. Luque, T. Watson 2012. NN Application of growing hierarchical SOM for visualisation of network forensics traffic data

2. Intelligent Database Systems Lab Outlines Motivation Objectives Methodology Experiments Conclusions Comments

3. Intelligent Database Systems Lab Motivation In information burst age,network of packets are too large cause network attack pattern difficult to find and identifying the error's data in the pattern that data take.

4. Intelligent Database Systems Lab Objectives We utilize GHSOM to find network attack pattern, have following advantage: – A visualisation technique can more intuitive and understandable. – Network attack pattern be easy find or judge.

5. Intelligent Database Systems Lab Methodology Growing hierarchical self-organising map – consists of several growing SOMs arranged in layers – quantitative features – qualitative features

6. Intelligent Database Systems Lab Methodology GHSOM flow charts

7. Intelligent Database Systems Lab Euclidean distance quantisation error hierarchical growth controlled Methodology

8. Intelligent Database Systems Lab Methodology winning neuron of the map weight vector update map growth controlled

9. Intelligent Database Systems Lab Experiments Feature extraction Finally feature subset – qualitative : IP source address, IP destination address, protocol type, source port – quantitative : date, time, packet length and delta time Captured packets handled missing value Feature selection

10. Intelligent Database Systems Lab Experiments Data visualization 3D GHSOM 2D GHSOM

11. Intelligent Database Systems Lab Experiments plot of the input data hits

12. Intelligent Database Systems Lab Experiments U-matrix

13. Intelligent Database Systems Lab Experiments Component planes – Layer 1

14. Intelligent Database Systems Lab Experiments Component planes – Layer 2

15. Intelligent Database Systems Lab Experiments distribution of countries of origin

16. Intelligent Database Systems Lab Conclusions The results show that the GHSOM can be used to cluster network traffic data and to represent this in a manner that can be of aid in network forensics. Therefore,this information can allow an expert in the field to successfully conclude a digital investigation.

17. Intelligent Database Systems Lab Comments Advantages – Use visualisation technique help user can more intuitive and understandable to watch data. Applications – Network forensics – network forensics