WPA vs WPA2

1) TKIP vs WEP
A cryptographic message integrity check to protect packets(MIC)
An initialization-vector sequencing mechanism that includes hashing, as opposed to WEP's plain text transmission
A per-packet key-mixing function to increase cryptographic strength
A re-keying mechanism to provide key generation every 10,000 packets.

2) WPA2
MIC->CCMP
RC4->AES



* Support for opportunistic key caching to reduce the overhead in roaming between access points;

* Support for pre-authentication