Install handshaker mac8/8/2023 This CWNP video explain well this process & have a look on it before go into details. If it is 802.1X/EAP, then 4 way handshake starts when EAP Authentication finished.īelow figure shows the steps involved in 4-Way handshake process. If it is PSK, 4 way handshak starts immediately after Open System Authentication & Association state finish as you can see below. Transport the GTK & GTK sequence number from Authenticator to Supplicant & install them in Supplicant & AP(if not already installed) Derive a fresh PTK from PMK & Install the pairwise encryption & integrity keys into 802.11Ĥ. GTK is derived on Authenticator & sending to supplicant during 4-Way Handshake (M3)Ĥ-Way handshake utilizing EAPOL-Key frames initiated by the Authenticator to do the following.ģ. GTK is used to encrypt all broadcast/multicast transmission between an AP & multiple client statsions. Temporal Key – used to encrypt & decrypt MSDU of 802.11 data frames between supplicant & authenticator KEK – Key Encryption Key– used by EAPOL-Key frames to provide data privacy during 4-Way Handshake & Group Key Handshake.ģ. KCK-Key Confirmation Key-used to provide data integrity during 4 -Way Handshake & Group Key Handshake.Ģ. This is used to encrypt all unicast transmission between client & an AP. GMK is randomly created on Authenticator & refresh it in configured time interval to reduce the risk of GMK being compromised.Ī value derived from PMK, Authenicator nonce(Anonce), Supplicant nonce(Snonce), Authenticator Address, Supplicant Address. It can be derived from an EAP method or directly from a PresharedKey(PSK). PMK is derived from MSK seeding material. This key information is transported via a secure channel from Authenticating Server to Authenticator. Key information that is jointly negotiated between the Supplicant & Authentication Server. Also watch this CWNP video for more detail about this key hierarchy. of this book shows the below RSN key hierarchy. This is described in Chapter 5 of CWSP Official Study Guide. Current work-around is to downgrade bluetoothd, proper solution is being investigated.In this post we will go through 4-Way Handshake process.
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