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Wireless & Mobility · Advanced

Group Temporal Key (GTK)

The shared key used to encrypt broadcast and multicast traffic within a BSS.

Definition

The GTK is delivered in message 3 of the 4-way handshake and updated with the group key handshake. It is shared by all clients of the BSS. The IGTK protects broadcast management frames under PMF.

Exam tip

Group key handshake rotates the GTK, for example when a client leaves.

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