u8.12 802.1i

u8.12 802.1i

1. WPA Protocol

2. Temporal Key Integrity Protocol (TKIP) was added to WPA

   • TKIP added 4 new functions of WPA
     • a Cryptographic message integrity code
       • Requires that the sender and receiver know a shared secret before the MIC can be calculated
     • IV sequencing methodology
       • Prevent replay attacks
     • A per-packet key mixing function,
       • to stop the public IV from being correlated to weak keys (preventing the FMS IV weakness attack).
     • A rekeying mechanism
       • provide fresh encryption and integrity keys
         • preventing attacks that rely on keys being reused
           • provides the 'temporal' label to TKIP's name

3. WPA2

   • 2 modes
     • Personal
       • Shared key security
     • Enterprise
       • enterprise authentication using existing auth servers
   • Implements CCMP an AES based encryption mode