In this way we can protect against a malious spoof access point which is broadcasting the valid looking SSID. They must the encrypt messages to each other, and if they can decrypt them, then they have successfully authenticated each other. It is designed so that the access point and wireless client can prove that they know each other by showing that the know the PSK/PMK, without ever releasing the key. Within WPA-2 we get the four-way handshake process, and which is illustrated in Figure 1. Print "Pairwise Master Key: " + PBKDF2(phrase, ssid, 4096).read(32).encode("hex")) A simple Python script to generate the PMK is: from pbkdf2 import PBKDF2 In this case the PMK is generated from 4096 iterations of the hashing method and creates a 256-bit PMK. The PMK is generated from the PSK with: PMK = PBKDF2(HMAC−SHA1, PSK, SSID, 4096, 256)Īnd where we use the SHA1 hashing function with HMAC as the message authentication code. Generally EAPOL is more difficult to crack than using PSK. Within PSK, the PSK is defined with the PMK, but within EAPOL, the PMK is derived from EAP parameters. This uses PBKDF2-SHA1 as a hashing method, as the PBKDF2 part makes difficult to crack the hash (as there are a number of rounds used to slow down the hashing process).
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After this phase a shared secret key is created, and is known as the Pairwise Master Key (PMK). The EAPOL exchange requires the usage of an authentication server. In the initial authentication we the client will either use pre-shared key (PSK), or use an EAP exchange through 802.1X (EAPOL).
![wpa2 hash crack wpa2 hash crack](https://s3.studylib.net/store/data/007849299_2-8265a684dd3cc7984247a25bb62e9734-768x994.png)
Wpa2 hash crack password#
Within WPA-2 we aim to create an initial pairing between the client and the access point, and then to identify them without giving away the password which has been used.