The AP replies with a set of supported PHY modes, a single convergence layer and a selected authentication and encryption procedure; an alternative is support for no authentication/encryption. Supported encryption algorithms are DES and 3-DES. The two alternatives for authentication are public key-based and pre-shared key authentication. If encryption is to be
employed then the mobile terminals start a Diffie–Hellman key exchange procedure in order to determine the secret session key. This is used for encryption of all unicast traffic between the AP and the mobile terminal
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