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cracking_wpa [2010/02/12 20:31] – Clarified the requirement for the deauthentication step. darkaudaxcracking_wpa [2022/01/02 21:34] (current) – Fixed dead links mister_x
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 ====== Tutorial: How to Crack WPA/WPA2 ====== ====== Tutorial: How to Crack WPA/WPA2 ======
-Version: 1.18 September 252009\\+Version: 1.20 March 072010\\
 By: darkAudax By: darkAudax
  
 ===== Introduction ===== ===== Introduction =====
  
-This tutorial walks you through cracking WPA/WPA2 networks which use pre-shared keys.  I recommend you do some background reading to better understand what WPA/WPA2 is.  The [[http://aircrack-ng.org|Wiki]] links page has a [[links#wpa_wpa2_information|WPA/WPA2 section]].   The best document describing WPA is [[http://www.hsc.fr/ressources/articles/hakin9_wifi/index.html.en|Wi-Fi Security - WEP, WPA and WPA2]].  This is the [[http://www.hsc.fr/ressources/articles/hakin9_wifi/hakin9_wifi_EN.pdf|link]] to download the PDF directly.  The [[wpa_capture|WPA Packet Capture Explained tutorial]] is a companion to this tutorial. +This tutorial walks you through cracking WPA/WPA2 networks which use pre-shared keys.  I recommend you do some background reading to better understand what WPA/WPA2 is.  The [[http://aircrack-ng.org|Wiki]] links page has a [[links#wpa_wpa2_information|WPA/WPA2 section]].   The best document describing WPA is [[https://web.archive.org/web/20120805090041/http://www.hsc.fr/ressources/articles/hakin9_wifi/index.html.en|Wi-Fi Security - WEP, WPA and WPA2]].  This is the [[https://web.archive.org/web/20120917034330/http://www.hsc.fr/ressources/articles/hakin9_wifi/hakin9_wifi_EN.pdf|link]] to download the PDF directly.  The [[wpa_capture|WPA Packet Capture Explained tutorial]] is a companion to this tutorial. 
  
 WPA/WPA2 supports many types of authentication beyond pre-shared keys.  [[aircrack-ng]] can ONLY crack pre-shared keys.  So make sure [[airodump-ng]] shows the network as having the authentication type of PSK, otherwise, don't bother trying to crack it. WPA/WPA2 supports many types of authentication beyond pre-shared keys.  [[aircrack-ng]] can ONLY crack pre-shared keys.  So make sure [[airodump-ng]] shows the network as having the authentication type of PSK, otherwise, don't bother trying to crack it.
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 It is recommended that you experiment with your home wireless access point to get familiar with these ideas and techniques. If you do not own a particular access point, please remember to get permission from the owner prior to playing with it. It is recommended that you experiment with your home wireless access point to get familiar with these ideas and techniques. If you do not own a particular access point, please remember to get permission from the owner prior to playing with it.
- 
-I would like to acknowledge and thank the [[http://trac.aircrack-ng.org/wiki/Team|Aircrack-ng team]] for producing such a great robust tool.  
  
 Please send me any constructive feedback, positive or negative. Additional troubleshooting ideas and tips are especially welcome. Please send me any constructive feedback, positive or negative. Additional troubleshooting ideas and tips are especially welcome.
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 ===== Equipment used ===== ===== Equipment used =====
- 
-To follow this tutorial at home, you must have two wireless cards. 
  
 In this tutorial, here is what was used: In this tutorial, here is what was used:
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    ath0            Atheros         madwifi-ng VAP (parent: wifi0)    ath0            Atheros         madwifi-ng VAP (parent: wifi0)
  
-The presence of a [phy0] tag at the end of the driver name is an indicator for mac80211, so the Broadcom card is using a mac80211 driver. **Note that mac80211 is supported only since aircrack-ng v1.0-rc1, and it won't work with v0.9.1, which this tutorial primarily refers to.**+The presence of a [phy0] tag at the end of the driver name is an indicator for mac80211, so the Broadcom card is using a mac80211 driver. **Note that mac80211 is supported only since aircrack-ng v1.0-rc1, and it won't work with v0.9.1.**
 Both entries of the Atheros card show "madwifi-ng" as the driver - follow the madwifi-ng-specific steps to set up the Atheros card. Both entries of the Atheros card show "madwifi-ng" as the driver - follow the madwifi-ng-specific steps to set up the Atheros card.
 Finally, the Ralink shows neither of these indicators, so it is using an ieee80211 driver - see the generic instructions for setting it up. Finally, the Ralink shows neither of these indicators, so it is using an ieee80211 driver - see the generic instructions for setting it up.
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 In the response above, you can see that ath0 is in monitor mode, on the 2.452GHz frequency which is channel 9 and the Access Point shows the MAC address of your wireless card.  Only the madwifi-ng drivers show the card MAC address in the AP field, other drivers do not.  So everything is good.   It is important to confirm all this information prior to proceeding, otherwise the following steps will not work properly. In the response above, you can see that ath0 is in monitor mode, on the 2.452GHz frequency which is channel 9 and the Access Point shows the MAC address of your wireless card.  Only the madwifi-ng drivers show the card MAC address in the AP field, other drivers do not.  So everything is good.   It is important to confirm all this information prior to proceeding, otherwise the following steps will not work properly.
  
-To match the frequency to the channel, check out: +To match the frequency to the channel, check out: http://www.cisco.com/en/US/docs/wireless/technology/channel/deployment/guide/Channel.html#wp134132 .  This will give you the frequency for each channel.
-http://www.rflinx.com/help/calculations/#2.4ghz_wifi_channels then select the "Wifi Channel Selection and Channel Overlap" tab.  This will give you the frequency for each channel.+
  
 === Step 1b - Setting up mac80211 drivers === === Step 1b - Setting up mac80211 drivers ===
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 To see if you captured any handshake packets, there are two ways.  Watch the airodump-ng screen for " WPA handshake: 00:14:6C:7E:40:80" in the top right-hand corner.  This means a four-way handshake was successfully captured.  See just above for an example screenshot. To see if you captured any handshake packets, there are two ways.  Watch the airodump-ng screen for " WPA handshake: 00:14:6C:7E:40:80" in the top right-hand corner.  This means a four-way handshake was successfully captured.  See just above for an example screenshot.
  
-use Wireshark and apply a filter of "eapol" This displays only eapol packets you are interested in.  Thus you can see if capture contains 0,1,2,3 or 4 eapol packets.+Use Wireshark and apply a filter of "eapol" This displays only eapol packets you are interested in.  Thus you can see if capture contains 0,1,2,3 or 4 eapol packets.
  
  
cracking_wpa.1266003084.txt.gz · Last modified: 2010/02/12 20:31 (external edit)