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The authentication process leaves two considerations: the access point (AP) still needs to authenticate itself to the client station (STA), and keys to encrypt the traffic need to be derived. The earlier EAP exchange or WPA2-PSK configuration has provided the shared secret key PMK (Pairwise Master Key). To derive the PMK from the WPA-PSK, the PSK is put through PBKDF2-SHA1 as the cryptographic hash function. This key is, however, designed to last the entire session and should be exposed as little as possible. Therefore the four-way handshake is used to establish another key called the PTK (Pairwise Transient Key). The PTK is generated by concatenating the following attributes: PMK, AP nonce (ANonce), STA nonce (SNonce), AP MAC address, and STA MAC address. The product is then put through a pseudo random function. http://en.wikipedia.org/wiki/IEEE_802.11i-2004
Fully agree with Romail link,
Here is the clue to answer this triky question: "...A four-way handshake is used to establish another key called the Pairwise Transient Key (PTK)..."
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enpuna
5 years, 4 months agoRomail
5 years, 11 months ago