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It then sends the MPPE keys to the access point inside a RADIUS Accept message. The access point generates two random WEP keys and encrypts and signs them using the MPPE keys it obtained from the RADIUS server.The access point then sends each encrypted WEP key to the wireless station inside individual EAPOL-Key messages.The shared portion of the key is static, and the dynamic IV is exchanged essentially in the clear.Both the static shared key and the small 24-bit IV represent security vulnerabilities.These two mechanisms, and nearly all others designed to protect wireless transactions, depend on setting up a secure tunnel using Secure Session Layer/Transport Layer Security (SSL/TLS).
The MPPE format is documented in RFC 2716.) The RADIUS server generates one MPPE key (the RECV key) for encryption and one (the SEND key) for signing.
You should still take the precaution of changing the Extended Service Set Identifier (ESSID) of the access point and disabling ESSID broadcasting.
This discourages war drivers (data vandals who cruise around looking for open access points).
Figure 3 shows a packet capture of this transaction. The station uses the same PRF inputs as those used by the RADIUS server to generate an identical set of MPPE keys that it uses to decrypt the WEP keys. The station then uses one of the WEP keys to encrypt the data stream and keeps the other in standby to use during key-refresh transactions. In a basic 802.1x EAPOL transaction, an access point generates a dynamic encryption key, then encrypts the key using cipher material obtained from a RADIUS server.
The client generates the same cipher material and uses it to decrypt the dynamic key.