User Tools Log In. Site Tools Search. Step 1 - Start the wireless interface in monitor mode. Step 2 - Start airodump-ng to collect authentication handshake. Step 3 - Use aireplay-ng to deauthenticate the wireless client. Step 4 - Run aircrack-ng to crack the pre-shared key. I Cannot Capture the Four-way Handshake! First, this solution assumes: You are using drivers patched for injection.
Use the injection test to confirm your card can inject. You are physically close enough to send and receive access point and wireless client packets. Remember that just because you can receive packets from them does not mean you may will be able to transmit packets to them. The wireless card strength is typically less then the AP strength. So you have to be physically close enough for your transmitted packets to reach and be received by both the AP and the wireless client.
You can confirm that you can communicate with the specific AP by following these instructions. You are using v0. If you use a different version then some of the command options may have to be changed. Here are the basic steps we will be going through: Start the wireless interface in monitor mode on the specific AP channel. Start airodump-ng on AP channel with filter for bssid to collect authentication handshake. To determine the driver and the correct procedure to follow , run the following command: airmon-ng On a machine with a Ralink, an Atheros and a Broadcom wireless card installed, the system responds: Interface Chipset Driver rausb0 Ralink RT73 rt73 wlan0 Broadcom b43 - [phy0] wifi0 Atheros madwifi-ng ath0 Atheros madwifi-ng VAP parent: wifi0 The presence of a [phy0] tag at the end of the driver name is an indicator for mac, so the Broadcom card is using a mac driver.
It should look similar to this: lo no wireless extensions. The system will respond: lo no wireless extensions. Instead, use the following command to set up your card in monitor mode on channel 9: airmon-ng start wlan0 9 The system responds: Interface Chipset Driver wlan0 Broadcom b43 - [phy0] monitor mode enabled on mon0 Notice that airmon-ng enabled monitor-mode on mon0.
The following output should appear: lo no wireless extensions. For other ieeebased drivers, simply run the following command to enable monitor mode replace rausb0 with your interface name : airmon-ng start rausb0 9 The system responds: Interface Chipset Driver rausb0 Ralink rt73 monitor mode enabled At this point, the interface should be ready to use. Enter: airodump-ng -c 9 --bssid C:7E -w psk ath0 Where: -c 9 is the channel for the wireless network.
This eliminates extraneous traffic. The deauthentication packets are sent directly from your PC to the clients. So you must be physically close enough to the clients for your wireless card transmissions to reach them.
To confirm the client received the deauthentication packets, use tcpdump or similar to look for ACK packets back from the client. Open another console session and enter: aircrack-ng -w password. Remember to specify the full path if the file is not located in the same directory.
Here are some troubleshooting tips to address this: Your monitor card must be in the same mode as the both the client and Access Point. Some drivers allow you to specify the mode. For information, 1, 2, 5. Sometimes you also need to set the monitor-mode card to the same speed. Be sure that your capture card is locked to the same channel as the AP.
Be sure there are no connection managers running on your system. TODO: include package list for other Linux distros. LMK if you figure any out! The output from lusb is:. I'm working to get this bit automated so it will scp the file to a GPU enabled rig, run it there and give you the results. This is a WIP, working to have complete by next week!
This software is for educational purposes, in order to learn about vulnurable systems to better be able to protect yourself. I'm a big believer in ethical hacking, so do not use this software to break any laws.
If we can grab the password at that time, we can then attempt to crack it. In this tutorial from our Wireless Hacking series, we'll look at using aircrack-ng and a dictionary attack on the encrypted password after grabbing it in the 4-way handshake.
Let's start by putting our wireless adapter in monitor mode. For info on what kind of wireless adapter you should have, check out this guide. This is similar to putting a wired adapter into promiscuous mode. It allows us to see all of the wireless traffic that passes by us in the air. Let's open a terminal and type:. Note that airmon-ng has renamed your wlan0 adapter to mon0 or wlan0mon if you are using a newer version of aircrack-ng.
Now that our wireless adapter is in monitor mode, we have the capability to see all the wireless traffic that passes by in the air. We can grab that traffic by simply using the airodump-ng command. Let's do this by typing:. Note all of the visible APs are listed in the upper part of the screen and the clients are listed in the lower part of the screen. Our next step is to focus our efforts on one AP, on one channel, and capture critical data from it.
Let's open another terminal and type:. WPAcrack is the file you want to write to. In order to capture the encrypted password, we need to have the client authenticate against the AP. If they're already authenticated, we can de-authenticate them kick them off and their system will automatically re-authenticate, whereby we can grab their encrypted password in the process.
In the previous step, we bounced the user off their own AP, and now when they re-authenticate, airodump-ng will attempt to grab their password in the new 4-way handshake. Go back to our airodump-ng terminal and check to see whether or not we've been successful.
If you are successful in capturing the 4-way handshake, the top line to the far right of airodump-ng says " WPA handshake ". This is the way it tells us we were successful in grabbing the encrypted password! That is the first step to success! Now that we have the encrypted password in our file WPAcrack, we can run that file against aircrack-ng using a password file of our choice. Remember that this type of attack is only as good as your password file.
I'll be using the large wordlist on Kali named rockyou. You can find it by typing;. We'll now attempt to crack the password by opening another terminal and typing:. This process can be relatively slow and tedious. Depending upon the length of your password list, you could be waiting a few minutes to a few days.
On my dual core 2. That works out to about 1. Your results will vary. When the password is found, it'll appear on your screen. Remember, the password file is critical. Try the default password file first and if it's not successful, advance to a larger, more complete password file such as one of these.
You can create a custom password list--that is likely to have a greater probability of success based upon knowledge of the target-- using crunch. All Posts. Recent Posts See All. Post not marked as liked. Post not marked as liked Online Store. Linux Firewalls. Advanced Linux. Network Basics for Hackers. Scripting for Hackers. Automobile Hacking. Linux Basics for Hackers. Introduction to Snort IDS. Cyber Warrior Training. Metasploit Basics for Hackers. CWA Prep Course. Digital Forensics.
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