Sniffer® Portable Professional User's Guide - NetScout

Setting Options in the Sniffer Window
NOTE: You can also perform postcapture decryption on trace files
saved without the Encryption options specified correctly. See
Postcapture 802.11 Decryption on page 199 for information on how to
decrypt encrypted data in a buffer or saved trace file.
To enter WEP encryption keys:
1 Display the Tools > Wireless > Encryption dialog box.
2 In the WEP Keys area, check the Enable box to turn on decryption
of WEP-encrypted packets.
3 Use the Key entry mode options to specify whether Sniffer
Portable Professional should use the same WEP keys on every
channel on the wireless network or different keys on different
channels.
Enable the Single Key Set option if you would like Sniffer
Portable Professional to use the specified WEP keys for every
channel on the wireless network.
Enable the Keys Per Channel option if you would like to
specify different sets of WEP keys for different topologies and
channels on the wireless network. Then, use the Topology,
Channel, and Key list to specify separate keys for individual
channels.
4 Use the Hex/ASCII radio buttons to specify the format in which
you’d like to enter the WEP keys.
5 You can enter up to four separate encryption keys. For each key,
do the following:
a Specify the length of the key by selecting the appropriate
option. Keys can be either None, 40-bit, or 128-bit. Use the
None option if no encryption is used on the network.
Depending on the length of the key specified, some or all of
the adjacent fields become active, enabling you to specify the
keys in use.
b Specify the exact, case-sensitive value for each key in the
adjoining spaces provided.
Keep the following in mind when entering keys in ASCII format:
An empty field is equivalent to a setting of None in Hex entry
mode (that is, no encryption is used on the network).
Five ASCII characters or 0x followed by 10 hex characters is
interpreted as a 40-bit key.
User’s Guide 59