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Message: <blockquote data-quote="SecondLife" data-source="post: 14930907" data-attributes="member: 469868"><img src="http://img.gawkerassets.com/img/17idgc21242wbjpg/ku-xlarge.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />You already know that if you want to lock down your Wi-Fi network, you should <a href="http://lifehacker.com/386675/secure-your-home-wi+fi-network" target="_blank">opt for WPA encryption</a> because WEP is easy to crack. But did you know how easy? Take a look.      Note:  This post demonstrates how to crack WEP passwords, an older and less  often used network security protocol. If the network you want to crack  is using the more popular WPA encryption, see our <a href="http://lifehacker.com/5873407/how-to-crack-a-wi+fi-networks-wpa-password-with-reaver" target="_blank">guide to cracking a Wi-Fi network's WPA password with Reaver</a> instead. Today we're  going to run down, step-by-step, how to crack a Wi-Fi network with WEP  security turned on. But first, a word: Knowledge is power, but power  doesn't mean you should be a jerk, or do anything illegal. Knowing <a href="http://lifehacker.com/399735/how-to-pick-a-lock-with-a-bump-key" target="_blank">how to pick a lock</a> doesn't make you a thief. Consider this post educational, or a proof-of-concept intellectual exercise. Dozens of  tutorials on how to crack WEP are already all over the internet using  this method. Seriously—Google it. This ain't what you'd call "news." But  what is surprising is that someone like me, with minimal networking  experience, can get this done with free software and a cheap Wi-Fi  adapter. Here's how it goes. What You'll Need <img src="http://img.gawkerassets.com/img/17ggkrsu8hf19png/original.png" alt="" class="fr-fic fr-dii fr-draggable " style="" />Unless  you're a computer security and networking ninja, chances are you don't  have all the tools on hand to get this job done. Here's what you'll  need: <ul> <li data-xf-list-type="ul">A compatible wireless adapter—This  is the biggest requirement. You'll need a wireless adapter that's  capable of packet injection, and chances are the one in your computer is  not. After consulting with my friendly neighborhood security expert, I  purchased an Alfa AWUS050NH USB adapter, pictured here, and it set me  back about $50 on Amazon. Update: Don't do what I did. Get the <a href="http://www.amazon.com/Alfa-AWUS036H-802-11b-Wireless-network/dp/B002WCEWU8?tag=lifehackeramzn-20&ascsubtag=[type%7Clink[postId%7C5305094" target="_blank">Alfa AWUS036H</a>, not the US050NH, instead. <a href="http://www.youtube.com/watch?v=oHq-cKoYcr8" target="_blank">The guy in this video</a> below is using a $12 model he bought on Ebay (and is even <a href="http://www.youtube.com/watch?v=bFlOHMj7Qoc" target="_blank">selling his router of choice</a>). There are <a href="http://www.aircrack-ng.org/doku.php?id=compatible_cards" target="_blank">plenty of resources on getting aircrack-compatible adapters out there</a>.</li> <li data-xf-list-type="ul"><a href="http://www.backtrack-linux.org/" target="_blank">A BackTrack Live CD</a>. We already took you on a <a href="http://lifehacker.com/5166530/backtrack-is-a-security+focused-live-cd-packed-with-system-tools" target="_blank">full screenshot tour of how to install and use BackTrack 3</a>,  the Linux Live CD that lets you do all sorts of security testing and  tasks. Download yourself a copy of the CD and burn it, or load it up in  VMware to get started.</li> <li data-xf-list-type="ul">A nearby WEP-enabled Wi-Fi network.  The signal should be strong and ideally people are using it, connecting  and disconnecting their devices from it. The more use it gets while you  collect the data you need to run your crack, the better your chances of  success.</li> <li data-xf-list-type="ul">Patience with the command line.  This is an ten-step process that requires typing in long, arcane  commands and waiting around for your Wi-Fi card to collect data in order  to crack the password. Like the doctor said to the short person, be a  little patient.</li> </ul>Crack That WEP To crack  WEP, you'll need to launch Konsole, BackTrack's built-in command line.  It's right there on the taskbar in the lower left corner, second button  to the right. Now, the commands. First run the following to get a list of your network interfaces: airmon-ng The only one I've got there is labeled ra0.  Yours may be different; take note of the label and write it down. From  here on in, substitute it in everywhere a command includes (interface). Now, run the following four commands. See the output that I got for them in the screenshot below. airmon-ng stop (interface) ifconfig (interface) down macchanger —mac 00:11:22:33:44:55 (interface) airmon-ng start (interface) <img src="http://img.gawkerassets.com/img/17ggkrsub9llbpng/ku-xlarge.png" alt="" class="fr-fic fr-dii fr-draggable " style="" />  If you don't get the same results from these commands as pictured here,  most likely your network adapter won't work with this particular crack.  If you do, you've successfully "faked" a new MAC address on your  network interface, 00:11:22:33:44:55. Now it's time to pick your network. Run: airodump-ng (interface) To see a  list of wireless networks around you. When you see the one you want, hit  Ctrl+C to stop the list. Highlight the row pertaining to the network of  interest, and take note of two things: its BSSID and its channel (in  the column labeled CH), as pictured below. Obviously the network you  want to crack should have WEP encryption (in the ENC) column, not WPA or  anything else. <img src="http://img.gawkerassets.com/img/17ggkrut97td8png/ku-xlarge.png" alt="" class="fr-fic fr-dii fr-draggable " style="" />  Like I said, hit Ctrl+C to stop this listing. (I had to do this once or  twice to find the network I was looking for.) Once you've got it,  highlight the BSSID and copy it to your clipboard for reuse in the  upcoming commands. Now we're going to watch what's going on with that network you chose and capture that information to a file. Run: airodump-ng -c (channel) -w (file name) —bssid (bssid) (interface) Where  (channel) is your network's channel, and (bssid) is the BSSID you just  copied to clipboard. You can use the Shift+Insert key combination to  paste it into the command. Enter anything descriptive for (file name). I  chose "yoyo," which is the network's name I'm cracking. <img src="http://img.gawkerassets.com/img/17ggkrutbx04dpng/ku-xlarge.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /> You'll get  output like what's in the window in the background pictured below. Leave  that one be. Open a new Konsole window in the foreground, and enter  this command: aireplay-ng -1 0 -a (bssid) -h 00:11:22:33:44:55 -e (essid) (interface) Here the ESSID is the access point's SSID name, which in my case is yoyo. What you want to get after this command is the reassuring "Association successful" message with that smiley face. <img src="http://img.gawkerassets.com/img/17ggkrut9v67spng/ku-xlarge.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /> You're almost there. Now it's time for: aireplay-ng -3 -b (bssid) -h 00:11:22:33:44:55 (interface) Here we're  creating router traffic to capture more throughput faster to speed up  our crack. After a few minutes, that front window will start going crazy  with read/write packets. (Also, I was unable to surf the web with the yoyo  network on a separate computer while this was going on.) Here's the  part where you might have to grab yourself a cup of coffee or take a  walk. Basically you want to wait until enough data has been collected to  run your crack. Watch the number in the "#Data" column—you want it to  go above 10,000. (Pictured below it's only at 854.) Depending on the power of your network (mine is inexplicably low at -32 in that screenshot, even though the yoyo  AP was in the same room as my adapter), this process could take some  time. Wait until that #Data goes over 10k, though—because the crack  won't work if it doesn't. In fact, you may need more than 10k, though  that seems to be a working threshold for many. <img src="http://img.gawkerassets.com/img/17ggkrwseb5uipng/ku-xlarge.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /> Once you've  collected enough data, it's the moment of truth. Launch a third Konsole  window and run the following to crack that data you've collected: aircrack-ng -b (bssid) (file name-01.cap) Here the  filename should be whatever you entered above for (file name). You can  browse to your Home directory to see it; it's the one with .cap as the  extension. If you didn't get enough data, aircrack will fail and tell you to try again with more. If it succeeds, it will look like this: <img src="http://img.gawkerassets.com/img/17ggkrws8f1gepng/ku-medium.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /> The WEP key appears next to "KEY FOUND." Drop the colons and enter it to log onto the network. Problems Along the Way With this  article I set out to prove that cracking WEP is a relatively "easy"  process for someone determined and willing to get the hardware and  software going. I still think that's true, but unlike the guy in the  video below, I had several difficulties along the way. In fact, you'll  notice that the last screenshot up there doesn't look like the  others—it's because it's not mine. Even though the AP which I was  cracking was my own and in the same room as my Alfa, the power reading  on the signal was always around -30, and so the data collection was very  slow, and BackTrack would consistently crash before it was complete.  After about half a dozen attempts (and trying BackTrack on both my Mac  and PC, as a live CD and a virtual machine), I still haven't captured  enough data for aircrack to decrypt the key. So while  this process is easy in theory, your mileage may vary depending on your  hardware, proximity to the AP point, and the way the planets are  aligned. Oh yeah, and if you're on deadline—Murphy's Law almost  guarantees it won't work if you're on deadline.[youtube]kDD9PjiQ2_U[/youtube]</blockquote>

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