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How to Break WEP EncryptionEdited by Tyler B, Tom Viren, Ben Rubenstein, Jack Herrick and 42 others

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Breaking any encryption involves knowing a few things. First, you have to knowthat there is an encryption scheme. Secondly, you must know how encryptionworks. Here's how to do it using a packet-sniffing program.

Steps1. 1

Use Linux. Windows cannot sniff WEP packets, but you can use a bootable CD

of Linux.

2. 2

Get a packet-sniffing program. Backtrack is a commonly-used option.Download the iso image and burn it on a bootable CD/DVD.

3. 3

Boot Linux and Backtrack. Use your bootable CD/DVDs.

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o Note that this operating system is not required to be installed on hard drive. Thatmeans whenever you shutdown the Backtrack, all your data will be lost.

4. 4

Select a start-up option. The following Backtrack screen will show after booting.Change the option with the up and down arrow keys and select one. This tutorialwill use the first option.

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5. 5

Load the graphical interface via command base. In this option, Backtrack isstarted on command base. Type command:startx to continue.

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6. 6

Click on terminal button at the bottom left. It'll be the fifth option.

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7. 7

Wait for the Linux command terminal to open.

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8. 8

View your WLAN type. Enter the following command: "airmon-ng" (without

quotes). You should see something like wlan0 beneath Interface.

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9. 9

Get all the required information for the access point. Enter the followingcommand: "airodump-ng wlan0" (without quotes). You should get three things:

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o BSSIDo Channelo

ESSID (AP Name)o Here's what the tutorial case turned up: BSSID 00:17:3F:76:36:6E Channel number 1 ESSID(AP Name)Suleman

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10. 10

Enter the following command. This one will use the example information

above, but you should plug in your own. Command: "airodump-ng -w wep -c 1 --bssid 00:17:3F:76:36:6E wlan0" (without quotes).

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11. 11

Allow setup to start.

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12. 12

Open a new terminal window. Type the following command, substituting thevalues for your own BSSID, Channel and ESSID. Command: "aireplay-ng -1 0 a00:17:3f:76:36:6E wlan0" (without quotes).

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13. 13

Open another new terminal window. Type the following command: "aireplay-ng-3 b 00:17:3f:76:36:6e wlan0" (without quotes).

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14. 14Allow setup to start.

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15. 15

Go back to the first terminal window.

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16. 16

Allow the data in this window to reach to 30000 or above. It will take 15 to 60minutes (or more) depending on wireless signal, hardware and load on accesspoint.

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17. 17

Go to the third terminal window and press Ctrl + c.

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18. 18

Pull up the directories. Type the following command: "dir" (without quotes).This will show the directories saved on it during decrypting.

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19. 19

Use a cap file. For the example, it would be the following: "aircrack-ng web-

02.cap" (without quotes). The setup shown below will start.

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20. 20Break the WEP encrypted key. After this setup completes, you'll be able tobreak the key. In this example, it was {ADA2D18D2E}.

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