802.11 sniffing

1. 802.11 sniffing Team #1

2. Easy to sniff • To sniff wired communication, must connect the wire between sender and receiver. • Because everybody shares the medium in wireless network, it’s easy to collect data.

3. Tools • Network analyzers • Active : NetStumber.. • Passive : airsnort, kismet… • Packet sniffers • kismet, ethereal, tcpdump… • We used kismet and ethereal

4. Sniffing - kismet

5. Sniffing - ethereal

6. Result by kismet • Many APs do not serve any security method. • even Netspot, too • Many packets are also not protected by any cipher.

7. Defense by air cracker • Use WEP as possible • Use SSL/TLS when you send password or something important • Huge sites like naver serve secure login for a default option. • DON’T use wireless internet when doing important thing • e.g. secret work in the office 

8. Further works • How to use ethereal effectively? • Using collected data dump directly is too dangerous. • Analyzing the ratio of each protocol is possible • Analyze the data collected by kismet

9. Thanks