You can also use vouchers for authentication. This is done by clicking on the Vouchers tab under Captive Portal. This page has two sections: Voucher Rolls, which shows any existing vouchers, and Create, Generate and Activate Rolls with Vouchers.
The Enable checkbox, when checked, begins the process of creating vouchers. The next two fields are for the Voucher Public Key and the Voucher Private Key. Here, you should paste an RSA public key and RSA private key (64 bits or smaller). The next field is Character set; this defines the characters contained in the generated tickets. You can probably keep the default value. The # of Roll Bits field reserves a range in each voucher to store the roll number to which it belongs. ...
