Cryptography Stack Exchange
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Questions tagged [wpa2-psk]

Wi-Fi Protected Access 2 - Pre-Shared Key (also called WPA or WPA2 Personal) is a method of securing your network using WPA2 with the use of the optional Pre-Shared Key (PSK) authentication, which was designed for home users without an enterprise authentication server.

Wi-Fi Protected Access 2 - Pre-Shared Key (also called WPA or WPA2 Personal) is a method of securing your network using WPA2 with the use of the optional Pre-Shared Key (PSK) authentication, which was designed for home users without an enterprise authentication server.

To encrypt a network with WPA2-PSK you provide your router with a plain-English passphrase between 8 and 63 characters long, instead of an encryption key. Using a technology called Temporal Key Integrity Protocol, that passphrase - along with the network SSID - is used to generate unique encryption keys for each wireless client. Those encryption keys are constantly changed.

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Why does WPA-PSK not use Diffie-Hellman key exchange?

Is there a reason, why in pre-shared key mode, Wi-Fi session key is not secured with something like Diffie-Hellman but instead is derived from PSK key and some information exchanged in clear during sign-on?
Michael
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Encryption algorithm used in WPA/WPA2

I want to know how EXACTLY the WPA password gets encrypted I have been searching through and I was able to catch: The actual password is converted to some hash Salting is applied to the hash The operation is not reversible The hash comes with the…
OverCoder
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How WPA2-PSK encryption works?

When a new client tries to connect with wi-fi, it enters a password which is provided by the wi-fi owner. I wonder what is so hard to capture this password by a hacker when it is being sent to router for authentication? Client can't encrypt this…
defalt
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If the PSK is known, is it possible to decrypt traffic from other clients in a WPA2 wlan network?

If in a public WLAN WPA2-PSK is used, but the PSK is more or less publicly available, does this mean that an attacker with that PSK can easily decrypt wlan traffic from/to other clients of that WLAN? Or does WPA2 negotiate sort of a per-client…
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Can a user of a password-protected Wi-Fi sniff on other user's communication?

Imagine a Wi-Fi network protected by WEP/WPA/WPA2. Users can join the network in case they know the pre-shared key of the access point. Is it possible for a user A (who has successfully logged into the network) to sniff on the data communication of…
Abdull
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Encoding information in packet lengths to actively sidestep encryption

If you've only got an encrypted data channel can you actively sidestep the encryption and communicate with an outside party who can see the data but cannot decrypt it? Yes - if you can find some leaky aspect in the process that's still visible after…
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How Pairwise Transient Key is derived or generated?

I recently study WPA/WPA2 security and I want to know how PTK is derived. I found these parameters in the IEEE 802.11 standard (2012): PRF - X(PMK, “Pairwise key expansion”, Min(AA,SPA) || Max(AA,SPA) || Min(ANonce,SNonce) ||…
ampika
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Is WPA2(PKS) AES vulnerable to 4 way hand shake and brute force attack?

I can easily crack a WPA TKIP using a dictionary/brute force method, provided that I collect the four way handshake. Is the same method possible on WPA2 AES? I cannot find any articles about '4 way handshake capture' and 'WPA2 AES cracking'…
picolo
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Understanding WPA2 authentication in details

As far as I know, WPA2 authentication consists of a 4-way handshake. The first message is from the AP, containing the ANounce, a random number generated by the AP, The second message is from the client, containing the SNounce concatenated with a MIC…
Biguinha
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Is WPA2 collision-proof?

I was experimenting with hashcat and aircrack to test WiFi security. The WiFi AP is a WPA2 encrypted network. The tool I used to capture is bettercap, which captured multiple WPA2 handshakes. The problem is that from those multiple handshakes I get…
Kristi
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Krack WPA2 decrypt only some small pieces of packets

I have gone through the paper (PDF) available at krackattacks.com. However, from what I understood you force a key reinstallation causing you a nonce reuse over 2 blob of data. As it is a keystream, you might be able to decrypt the data. Limitations…
FdLSifu
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What is CCM -- Counter Mode Cipher Block Chaining Message Authentication Code Protocol

CCM puts together two different modes of operation (at least in the name). Does it mean data is encrypted using counter mode and then encrypted using CBC; kind of a double encryption?
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WPA/WPA2 Handshake -- Why are Nonces not encrypted?

During the WPA/WPA2 handshake, the client and AP compute a 256-bit Pre-shared Master Key (PMK) before exchanging Nonces that are used to compute the eventual key. Given that the hosts already have a shared key (the PMK); why dont they use it to…
Minaj
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What is the exact algorithm and functions of the 4 way handshake?

I have to make a detailed diagram of the 4 way handshake and formulas for its functions so I need to know the exact process behind it. Like precisely what functions are used in it? I have been trying to search this for days but all I can find is…
Gnu
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How do attacks on WEP work?

There is an abundance of tools and tutorials on how to break WEP encryption. However, I fail to find a nice resource that gives a clear break-down of why the attacks are possible. For example, I know that one of the attacks relies on fake…
Minaj
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