- WEP MPDU
|Figure 1: WEP MPDU|
- WPA/TKIP MPDU
|Figure 2: WPA MPDU|
- WPA2/CCMP MPDU
|Figure 3: CCMP MPDU|
- WEP 40(5 char)/104(13 char) uses 40/104 bits WEP Key respectively which is STATIC.
- WEP is prone to IV collisions & weak WEP keys.
- No Sequence number & MIC is available. Hence, prone to many other attacks.
- Upto 4 keys can be defined on each end & different key can be used for encryption & decryption.
Advantages over WEP:
- Uses Dynamic keys (temporal key PTK, GTK) which is generated after 4 Way handshake. PTK/GTK is 128 bits long.
- WEP Seed generation is made more advanced.
- MIC introduced which provides data integrity.
- TSC Introduced: Transmit Sequence number helps to prevent replay & re-injection attacks.
- TKIP countermeasures defined in case of MIC failure.
- MIC protects certain portion of MAC header along with data.