1. Wireless LAN Security Jerry Usery CS 522 December 6 th, 2006

2. Wireless LAN Security - Overview WEP WEP Vulnerability WPA Standards 802.11i

3. Wireless LAN Security – WEP Secret Key  40-bit  104-bit 24-bit Initialization Vector 32-bit Integrity Check Vector  Cyclic Redundancy Check  RC4 Algorithm

4. Wireless LAN Security – WEP Wired Equivalent Privacy (WEP) protocol used to control access to wireless LANs and to encrypt information. (International Journal of Computer Science and Network Security (IJCSNS), VOL.6 No.5B, May 2006)

5. Wireless LAN Security – WEP Vulnerability A Wired Equivalent Privacy (WEP) weakness. The attacker can monitor encrypted transmissions and captures IVs, lookup the corresponding WEP key and easily decrypts the transmitted data. (From IJCSNS International Journal of Computer Science and Network Security, VOL.6 No.5B, May 2006)

6. Wireless LAN Security – WPA Wi-Fi Protected Access  IEEE 802.1x  Temporal Key Integrity Protocol (TKIP)  WEP 104-bit encryption key  Message Integrity Check (MIC)  Interim Software Upgrade

7. Wireless LAN Security - Standards Family of IEEE standards – 802.11 umbrella  802.11b, a, c, d, e, f, g, h, i, (and more) 802.11b – Basic, ubiquitous 802.11g – More… 802.11i – Better security

8. Wireless LAN Security – 802.11i Supplement to MAC layer Port-level access control protocol Includes WPA technologies  TKIP Dynamic keys Per-packet & per session ciphering 48-bit IV hashing IV not sent in clear text Advanced Encryption System (AES) Replaces WEP’s RC4 algorithm Need new hardware

9. Summary WEP WEP Vulnerability WPA Standards 802.11i

10. Wireless LAN Security Questions?