WPA2 is the Wi-Fi Alliance's brand for the final 802.11i standard, ratified in June 2004. WPA2 is a superset of WPA, adding several new features:
- AES encryption becomes an alternative to RC4 encryption. AES is more efficient and ultimately more secure than RC4 when used over 802.11 wireless.
- 802.1X Authentication can be used by ad hoc (peer to peer) 802.11 connections. 802.1X can be used with WPA for infrastructure (AP-based) networks only.
- Options for speeding 802.1X re-authentication have been added, including key caching and pre-authentication. These are particularly helpful for VoWLAN.
This was first published in July 2004