When it comes to securing your Wi-Fi network, we always recommend WPA2-PSK encryption. It’s the only really effective way to restrict access to your home Wi-Fi network. But WPA2 encryption can be cracked, too — here’s how.
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Steps to crack WPA/WPA2 WiFi Password using Fluxion Scan the networks. Capture a handshake (can’t be used without a valid handshake, it’s necessary to verify the password). Use WEB Interface. Launch a FakeAP instance to imitate the original access point. Spawns a MDK3 process, which.
As usual, this isn’t a guide to cracking someone’s WPA2 encryption. It’s an explanation of how your encryption could be cracked and what you can do to better protect yourself. It works even if you’re using WPA2-PSK security with strong AES encryption.
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Crack WPA2 Networks with the New PMKID Hashcat Attack Tutorial - Duration: 18:58. Null Byte 249,437 views. This handshake is WPA2-PSK’s Achilles’ heel. An attacker can use a tool like airodump-ng to monitor traffic being transmitted over the air and capture this four-way handshake. They’d then have the raw data they need to perform an offline attack, guessing possible passphrases and trying them against the four-way-handshake data until they find one that matches.
RELATED:Brute-Force Attacks Explained: How All Encryption is Vulnerable
There are two types of ways to potentially crack a password, generally referred to as offline and online. In an offline attack, an attacker has a file with data they can attempt to crack. For example, if an attacker managed to access and download a password database full of hashed passwords, they could then attempt to crack those passwords. They can guess millions of times per second, and they’re only really limited by how fast their computing hardware is. Clearly, with access to a password database offline, an attacker can attempt to crack a password much more easily. They do this via “brute-forcing” — literally attempting to guess many different possibilities and hoping one will match.
An online attack is much more difficult and takes much, much longer. For example, imagine an attacker were trying to gain access to your Gmail account. They could guess a few passwords and then Gmail would block them from trying any more passwords for a while. Because they don’t have access to the raw data they can attempt to match passwords against, they’re limited dramatically. (Apple’s iCloud wasn’t rate-limiting password guesses in this way, and that helped lead to the huge theft of nude celebrity photos.)
We tend to think of Wi-Fi as being only vulnerable to the online attack. An attacker will have to guess a password and attempt to log into the WI-Fi network with it, so they certainly can’t guess millions of times per second. Unfortunately, this isn’t actually true.
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The Four-Way Handshake Can Be Captured
RELATED:How an Attacker Could Crack Your Wireless Network Security
When a device connects to a WPA-PSK Wi-Fi network, something known as the “four-way handshake” is performed. Essentially, this is the negotiation where the Wi-Fi base station and a device set up their connection with each other, exchanging the passphrase and encryption information. This handshake is WPA2-PSK’s Achilles’ heel.
An attacker can use a tool like airodump-ng to monitor traffic being transmitted over the air and capture this four-way handshake. They’d then have the raw data they need to perform an offline attack, guessing possible passphrases and trying them against the four-way-handshake data until they find one that matches.
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If an attacker waits long enough, they’ll be able to capture this four-way handshake data when a device connects. However, they can also perform a “deauth” attack, which we covered when we looked at how your Wi-Fi network could be cracked. The deauth attack forcibly disconnects your device from its Wi-FI network, and your device immediately reconnects, performing the four-way handshake which the attacker can capture.
Image Credit: Mikm on Wikimedia CommonsCracking the WPA Handshake
With the raw data captured, an attacker can use a tool like cowpatty or aircrack-ng along with a “dictionary file” that contains a list of many possible passwords. These files are generally used to speed up the cracking process. The command tries each possible passphrase against the WPA handshake data until it finds one that fits. As this is an offline attack, it can be performed much more quickly than an online attack. An attacker wouldn’t have to be in the same physical area as the network while attempting to crack the passphrase. The attacker could potentially use Amazon S3 or another cloud computing service or data center, throwing hardware at the cracking process and speeding it up dramatically.
As usual, all these tools are available in Kali Linux (formerly BackTrack Linux), a Linux distribution designed for penetration testing. They can be seen in action there.
It’s tough to say how long it would take to crack a password in this way. For a good, long password, it could take years, possibly even hundreds of years or longer. If the password is “password”, it would probably take less than a single second. As hardware improves, this process will speed up. It’s clearly a good idea to use a longer password for this reason — 20 characters would take a lot longer to crack than 8. Changing the password every six months or every year could also help, but only if you suspect someone is actually spending months of computer power to crack your passphrase. You’re probably not that special, of course!
Breaking WPS With Reaver
RELATED:Don’t Have a False Sense of Security: 5 Insecure Ways to Secure Your Wi-Fi
There’s also an attack against WPS, an unbelievably vulnerable system that many routers ship with enabled by default. On some routers, disabling WPS in the interface doesn’t do anything — it stays enabled for attackers to exploit!
Essentially, WPS forces devices to use an 8-digit numerical PIN system that bypasses the passphrase. This PIN is always checked in groups of two 4-digit codes, and the connecting device is informed whether the four-digit section is correct. In other words, an attacker just has to guess the first four digits and then they can guess the second four digits separately. This is a fairly quick attack that can take place over the air. If a device with WPS didn’t work in this extremely insecure way, it would be violating the WPS specification.
WPA2-PSK likely has other security vulnerabilities we haven’t discovered yet, too. So, why do we keep saying WPA2 is the best way to secure your network? Well, because it still is. Enabling WPA2, disabling the older WEP and WPA1 security, and setting a reasonably long and strong WPA2 password is the best thing you can do to really protect yourself.
Yes, your password can probably be cracked with some amount of effort and computing power. Your front door could be cracked with some amount of effort and physical force, too. But, assuming you use a decent password, your Wi-Fi network will probably be okay. And, if you use a half-decent lock on your front door, you’ll probably be okay as well.
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Posted by Vishnu Valentino in Hacking Tutorial | 241 comments
After the long holiday, first I want to say Merry Christmas and Happy new year 2014 to you. Igo usa download. Today we will learn about 5 Steps Wifi Hacking – Cracking WPA2 Password. A lot of readers send many request regarding how to crack wireless WPA2 password in our request tutorial page.
According to Wikipedia :
Wi-Fi Protected Access (WPA) and Wi-Fi Protected Access II (WPA2) are two security protocols and security certification programs developed by the Wi-Fi Alliance to secure wireless computer networks. The Alliance defined these in response to serious weaknesses researchers had found in the previous system, WEP (Wired Equivalent Privacy)
A flaw in a feature added to Wi-Fi, called Wi-Fi Protected Setup (WPS), allows WPA and WPA2 security to be bypassed and effectively broken in many situations. Many access point they have a Wifi Protected Setup enabled by default (even after we hard reset the access point).
Requirements:
1. Wireless card (support promiscuous mode)
In this tutorial I use ALFA AWUS036H from Amazon.
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2. Access point with WPA2 and WPS enables
5 Steps Wifi Hacking – Cracking WPA2 Password:
1. Open our terminal (CTRL+ALT+T) and type airmon-ng (view tips and tricks how to create keyboard shortcut on kali linux)
this command will lists our wireless card that attached with our system.
2. The next step we need to stop our wireless monitor mode by running airmon-ng stop wlan0
3. Now we ready to capture the wireless traffic around us. By running airodump-ng wlan0 our wireless interface will start capturing the data.
From the picture above, we can see many available access point with all the information. In the green box is our victim access point which is my own access point ?
Information:
BSSID (Basic Service Set Identification): the MAC address of access point
PWR: Signal level reported by the card.
Beacons: Number of announcements packets sent by the AP
#Data: Number of captured data packets (if WEP, unique IV count), including data broadcast packets.
#/s: Number of data packets per second measure over the last 10 seconds.
CH: Channel number (taken from beacon packets).
MB: Maximum speed supported by the AP. If MB = 11, it’s 802.11b, if MB = 22 it’s 802.11b+ and higher rates are 802.11g.
ENC: Encryption algorithm in use.
CIPHER: The cipher detected. TKIP is typically used with WPA and CCMP is typically used with WPA2.
AUTH: The authentication protocol used.
ESSID: Shows the wireless network name. The so-called “SSID”, which can be empty if SSID hiding is activated.
4. From the step 3 above, we can find access point with encryption algorithm WPA2 and note the AP channel number. Now we will find out whether target AP has WPS enabled or not.
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if the WPS Locked status is No, then we ready to crack and move to step 5.
5. The last step is cracking the WPA2 password using reaver.
reaver -i <your_interface> -b <wi-fi victim MAC address> –fail-wait=360
Because we already get the information from step 3 above, so my command look like this:
reaver -i wlan0 -b E0:05:C5:5A:26:94 –fail-wait=360
it took about 5 hours to crack 19 characters WPA2 password (vishnuvalentino.com) from my Kali virtualBox, but it depend with our hardware and wireless card.
Conclusions:
1. WPA and WPA2 security implemented without using the Wi-Fi Protected Setup (WPS) feature are unaffected by the security vulnerability.
2. To prevent this attack, just turn off our WPS/QSS feature on our access point. See picture below (I only have the Chinese version ? )
Notes: Only practice this tutorial on your own lab and your own device. Hacking can be a crime if you don’t know where to put it.
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Blogger at hacking-tutorial.com. Love PHP, offensive security and web. Contact him at me[-at-]vishnuvalentino.com
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