IGTK (Integrity Group Temporal Key) KDE Used for management frame protection (802.11w PMF)
Integrity Group Temporal Key (16 or 32 bytes)
IPN - Integrity Protection Number (6 bytes) - replay protection
Key ID (2 bytes) - identifies IGTK (typically 4 or 5)
IGTK (Integrity Group Temporal Key) KDE Used for management frame protection (802.11w PMF)