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AirPcap User’s Guide 19
WEP keys are array of bytes of arbitrary length expressed in hexadecimal.
WPA and WPA2 keys can be of two types:
• Passphrase (WPA-PWD): This is the Passprase and SSID
combination most often used to configure WPA and WPA2. The
passphrase is a string between 8 and 63 characters in length. The
SSID can be omitted, in which case Wireshark will use the last-
seen SSID on the network. Non-printable characters can be
represented by a “%” character followed by a hexadecimal
number for both the passphrase and SSID. The passphrase and
SSID are used to derive Pre-Shared Key.
• Pre-Shared key (WPA-PSK): This allows the user to provide a
binary TKIP or CCMP key (used to derive the temporary key of
each session) which is normally the kind of key returned by tools
like Aircrack. The key is 256 bit long, and is expressed as a hex
string (64 characters). A tool to convert a passphrase and SSID
into a 256-bit PSK can be found on the Wireshark web site at
http://www.wireshark.org/tools/wpa-psk.html.
The keys that you specify in this list are global. Every AirPcap adapter,
included the Multi-Channel Aggregator, will use them.
The Multi-Channel Aggregator (applies to USB AirPcap adapters
only)
The Multi-Channel Aggregator has its own FCS Filter, Capture Type and
option to Include 802.11 FCS in Frames. These settings, and not the ones
of the physical adapter, will be used by when capturing from the Multi-
Channel Aggregator.
However, it’s not possible to set the channel of the Multi-Channel
Aggregator; instead, the channel drop-down box will show the list of the
aggregated channels. Multichannel aggregation is not available with the
AirPcap N Cardbus adapter.
To change the channel of any individual adapter, select the
Capture→Options menu item, select the desired interface, click on the
Wireless Settings button and then set the channel value in the channel
drop-down box.