Review Wireless
WiFi and security

This tutorial presents the security principles that you should employ on your wireless network to protect yourself from nasty people on the internet. You will also discover the standards that are employed in wireless technology

Tags : WiFi security, wep key, wap key, protect wireless network

WiFi and security

February 07th, 2006 - 06:00 pm ET by Laurent K.
  1. 1 - Introduction and Pre-requisites
  2. 2 - Different wireless network types – Part 1
  3. 3 - Different wireless network types – Part 2
  4. 4 - Basic principles for wireless network security – WEP Encryption – Part 1
  5. 5 - Basic security principles of a wireless network – WPA and WPA2 encryption – Part 2
  6. 6 - Auditing under Linux – Penetrating a wireless network – Part 1
  7. 7 - Auditing with Linux – Penetrating a WiFi network – Part 2
  8. 8 - Auditing with Windows – Penetrating a Wi-Fi network
  9. 9 - How to crack WPA keys under Linux '
  10. 10 - Conclusion

Step 3 :

You can see here that the tool being used is airodump and the targeted network is called sittingduck. In the back window, the aircrack tool is still capturing and analysing the encoded data packets.

Just a reminder: The WEP protocol only uses 104 bits in its 128 bit encryption as the last packets (24Bits) are part of the key that are passing “in clear” text.

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Step 4 :

Now that we have gathered the packets and saved them on our USB key, we need to open (simultaneously with the other tools, leaving them to continue to record the useful packets) the topcrack.cap file in order to launch the wepcrack tool. This will allow us to “break” the WEP SSID key which is being used here.

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Step 5 :

We now get to see the wepcrack tool in action with the previously captured packets. As you will notice, on the part that is selected in white, wepcrack took only 5 seconds to find the WEP key indicated in red at the bottom of the window....

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To summarize, you can easily understand that the integrity of your network is not safe if you are using WEP encryption making it not a solution for protecting your network data. It is easily possible to penetrate your network and to break the key in just a few minutes… Nevertheless, even though this technique remains available only to Linux users, it is still not difficult for small jokers to be able to connect and use the wireless connection of their neighbours...


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