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GENCASES(1)		  BSD General Commands Manual		   GENCASES(1)

NAME
     gencases — 802.11b weak IV generation tool

SYNOPSIS
     gencases (-s pw | -h key) -f file [-n num]

DESCRIPTION
     gencases is used to generate test 802.11b packets that are encrypted with
     weak initialization vectors as described by Fluhrer, Mantin, and Shamir
     (FMS). The packets are saved to a user specified file in libpcap compati‐
     ble format for later use with the airsnort(1) program. The intent is to
     provide airsnort with the packets required to demonstrate the FMS attack.

     Arguments to gencases allow the user to specify the WEP key that will be
     used to encrypt the packets as well as the number of packets to be gener‐
     ated for each byte of the wep key.	 The generated packets represent UDP
     echo requests from host 192.168.0.2 (on a wired net) to host 192.168.0.10
     (on a wireless net) and the corresponding replies. The wireless client
     has MAC 00:02:2d:01:23:45, the wired host has MAC 00:04:5A:AB:CD:EF, and
     the access point has BSSID 00:02:2D:98:76:54.

     The generated packet file can be examined with standard packet analysis
     tools such as tcpdump or ethereal.	 It can also be loaded into
     airsnort(1) which, given that a sufficient number of cases were generated
     for each key byte, will produce a cracked WEP key. Running the generated
     file through the decrypt(1) utility will produce the decrypted versions
     of the packets which should reflect the echo request/reply traffic
     described above, and which can be verified using tcpdump or ethereal.

OPTIONS
     -s pw	   Password as an ASCII string. 5 or 13 characters for 40 and
		   128 bit WEP cases respectively.

     -h key	   Password as a colon separated list of 2 digit hex values. 5
		   or 13 hex values for 40 and 128 bit WEP cases respectively.

     -f file	   Output file for generated cases.

     -n num	   Number of sample cases to generate for each key byte
		   (1-256). Default is 100.

EXAMPLES
     Generate 100 cases per key byte with the ASCII password "hello" to file
     "test"

	   gencases -s hello -f test

     Generate 200 cases per key byte with the hex key "23:56:89:ab:de" to file
     "test"

	   gencases -h 23:56:89:ab:de -f test -n 200

SEE ALSO
     airsnort(1) decrypt(1)

AUTHORS
     Jeremy Bruestle <melvin@melvin.net>
     Blake Hegerle <blake@melvin.net>
     Snax <snax@shmoo.com>

Linux				August 18, 2002				 Linux
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