Transcript Citibank (Slovakia)

Security of Wireless Local
Area Network
Adrián Lachata
Štefan Pero
Why should we interest
in security of WLAN?
How we can make WLAN safe?
Standard IEEE 802.11
• Change default settings
(IP addresses, login, password etc)
• Disable SSID broadcast
• MAC filtering
• extension WEP, WPA, WPA 2...
WEP (Wired Equivalent Privacy)
• Authentication
– Open System authentication
– Shared Key authentication (everyone
shares the one key)
WEP encryption
Picture 1: Basic WEP encryption: RC4 Keystream XORed
with plain text.
WEP weaknesses
Attacks
Passive Attack to Decrypt Traffic
Active Attack to Inject Traffic
Active Attack from Both Ends
Table-based Attack
WPA (Wi-Fi Protected Access )
• WPA
– TKIP
• WPA 2
– AES
– EAP …
Thank you for your
attention