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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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