When Wi-Fi was first developed in the late 1990s, Wired Equivalent Privacy was created to give wireless communications confidentiality. WEP, as it became known, proved terribly flawed and easily cracked. You can read more about that in my beginner's guide to hacking Wi-Fi.
As a replacement, most wireless access points now use Wi-Fi Protected Access II with a pre-shared key for wireless security, known as WPA2-PSK. WPA2 uses a stronger encryption algorithm, AES, that's very difficult to crack—but not impossible. My beginner's Wi-Fi hacking guide also gives more information on this.
Sep 19, 2018 You need a monitor mode Wifi adapter. Well i am not going to provide you whole tutorial. But I am Going To provide the tool name called Fluxion-Master Download it. Hack WPA/WPA2 WiFi With Kali Linux – Most of the modern routers are secured from all types of attacks. So there are possibilities that the first method may not work. But this second method works flawlessly to hack any WPA, WPA2, WPA2 – PSK wifi network using kali linux. Also this second method is a bit more complicated for beginners. 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. So make sure airodump-ng shows the network as having the authentication type of PSK, otherwise, don't bother trying to crack it. There is another important difference between cracking WPA/WPA2 and WEP. This is the approach used to crack the WPA/WPA2 pre-shared key.
The weakness in the WPA2-PSK system is that the encrypted password is shared in what is known as the 4-way handshake. When a client authenticates to the access point (AP), the client and the AP go through a 4-step process to authenticate the user to the AP. If we can grab the password at that time, we can then attempt to crack it.
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.
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.
Your Passphrase Can Be Cracked Offline
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.
Wpa2-psk Password Hack Android Without Root
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.
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.
Wpa2 Psk Password Hack
Image Credit: Mikm on Wikimedia Commons
Cracking 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.
Wpa2-psk Password Hack Windows 7
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!
Wpa2 Psk Password Cracker Android
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.
Wpa2 Psk Password
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