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The WEP/WPA Keys window allows WEP or WPA keys to be entered for the decryption of captured packets. Without these keys, the program will not be able to decrypt data packets being transmitted on your WLAN. Since some WLANs use mixed mode encryption, where both WEP- and WPA-enabled clients can authenticate, you can use a WEP key and WPA passphrase simultaneously.
WEP
The standard allows you to use up to four WEP keys, so you can specify one, two, three, or four keys. The key length drop-down list allows you to select the key length. Supported lengths are 64, 128, 152, and 256 bits, and you should enter a hexadecimal string that is 10, 26, 32, or 58 characters long correspondingly.
WPA
The Wi-Fi Protected Access (WPA) standard defines a number of authentication and encryption modes. Not all of them are supported by CommView for WiFi due to the restrictions of the underlying security model. CommView for WiFi supports decryption of WPA or WPA2 in Pre-Shared Key (PSK) mode using Temporal Key Integrity Protocol (TKIP) or Advanced Encryption Standard/Counter CBC-MAC Protocol (AES/CCMP) data encryption. You can enter either a passphrase or a hexadecimal key that is 64 characters long.
Important: Please refer to the Understanding WPA Decryption chapter for detailed information about the way CommView for WiFi processes WPA-encrypted traffic. You may also want to use the Node Reassociation tool once you've entered a new WPA passphrase.
To save the current key set, click Save …. To load a previously saved key set, click Load ….
The key set that you can enter or load using this dialog will be applied to packets captured in real-time, as well as to any NCF capture files that might have been saved previously. When captured packets are saved to a NCF capture file, those packets that were decrypted successfully will be saved in decrypted form, while those packets that could not be decrypted will be saved in the original, unmodified form.
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