The system responds by showing how many packets it is injecting and reminds you to start airodump-ng if it has not already been started:. You can run this while generating packets. In a short time, the WEP key will be calculated and presented. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account.
You are commenting using your Facebook account. Notify me of new comments via email. Notify me of new posts via email. Home About. Premium Accounts Free Premium Accounts! The ones we will be using are:. As mentioned above, to capture network traffic wihtout being associated with an access point, we need to set the wireless network card in monitor mode.
To do that under linux, in a terminal window logged in as root , type:. NIC should be stopped before chaning MAC address iwconfig wlan0 mode monitor to set the network card in monitor mode ifconfig wlan0 up to start the network card iwconfig - similar to ifconfig, but dedicated to the wireless interfaces. This step assumes you've already set your wireless network interface in monitor mode.
It can be checked by executing the iwconfig command. Next step is finding available wireless networks, and choosing your target:.
To capture data into a file, we use the airodump-ng tool again, with some additional switches to target a specific AP and channel. Most importantly, you should restrict monitoring to a single channel to speed up data collection, otherwise the wireless card has to alternate between all channels.
Assuming our wireless card is mon0, and we want to capture packets on channel 6 into a text file called data:. Running airodump-ng on a single channel targeting a specific access point Notes: You typically need between 20, and 40, data packets to successfully recover a WEP key. One can also use the "--ivs" switch with the airodump-ng command to capture only IVs, instead of whole packets, reducing the required disk space. However, this switch can only be used if targeting a WEP network, and renders some types of attacks useless.
Increase Traffic aireplay-ng - optional step for WEP cracking. An active network can usually be penetrated within a few minutes. However, slow networks can take hours, even days to collect enough data for recovering the WEP key. The aireplay-ng command should be executed in a separate terminal window, concurrent to airodump-ng.
It requires a compatible network card and driver that allows for injection mode. You may also want to read the information available -here-.
To see all available replay attacks, type just: aireplay-ng. WEP cracking is a simple process, only requiring collection of enough data to then extract the key and connect to the network. You can crack the WEP key while capturing data. In fact, aircrack-ng will re-attempt cracking the key after every packets. Usually, between 20k and 40k packets are needed to successfully crack a WEP key. It may sometimes work with as few as 10, packets with short keys. What this means is, you need to wait until a wireless client associates with the network or deassociate an already connected client so they automatically reconnect.
All that needs to be captured is the initial "four-way-handshake" association between the access point and a client. This can be obtained using the same technique as with WEP in step 3 above, using airodump-ng.
You may also try to deauthenticate an associated client to speed up this process of capturing a handshake, using:. Note the last two numbers in brackets [ ACKs] show the number of acknowledgements received from the client NIC first number and the AP second number. It is important to have some number greater than zero in both. If the first number is zero, that indicates that you're too far from the associated client to be able to send deauth packets to it, you may want to try adding a reflector to your antenna even a simple manilla folder with aluminum foil stapled to it works as a reflector to increase range and concentrate the signal significantly , or use a larger antenna.
Simple antenna reflector using aluminum foil stapled to a manilla folder can concentrate the signal and increase range significantly. For best results, you'll have to place the antenna exactly in the middle and change direction as necessary. Of course there are better reflectors out there, a parabolic reflector would offer even higher gain, for example.
See related links below for some wordlist links. You can, then execute the following command in a linux terminal window assuming both the dictionary file and captured data file are in the same directory :. After that, an offline dictionary attack on that handshake takes much longer, and will only succeed with weak passphrases and good dictionary files.
My record time was less than a minute on an all-caps character passphrase using common words with less than 11, tested keys! A modern laptop can process over 10 Million possible keys in less than 3 hours.
This is the raw packet dump that you'll use to crack the WEP passphrase. Type man airodump-ng for help. This is the MAC address of the router that you're targeting. Since there may be multiple wireless networks around, airodump-ng needs to know what wireless traffic to capture. This lets it know to capture all traffic involving the base station with this MAC address.
Here we specify the channel number that we found using airmon-ng. Should be an integer from The output of this command is refreshed every few seconds. As new devices join the network, they'll show up on this screen, as will statistics about their packet traffic. The second stage of this attack involves sending spoofed packets. These packets look like they're coming from the device that's connected - but they'll actually come from the Kali computer that's carrying out the attack.
The router responds to these spoofed packets as though they're real, flooding the network with traffic and giving us the increase in traffic that we need to sniff out the WPA passphrase. To do this, we need two pieces of information: the MAC address of the router, and the MAC address of the client that we're spoofing. The second piece of information will show up in the airodump-ng command window, where we'll see our client show up when they connect to the network. Their MAC address will be shown.
Your modem or router will have a password called this. When prompted, you will need to enter the WEP Key you have already created. Table of contents 1. You can access the router configuration menu by clicking here… You can access this page by clicking the Top menu.
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