code: def install_GTK(self):
          
  
          # Compute GTK
          self.gtk_full = self.gen_nonce(32)
          self.gtk = self.gtk_full[:16]
  
          # Extract derivated keys
          self.mic_ap_to_group = self.gtk_full[16:24]
  
          # Reset IV
          self.group_iv = count()
docs: Compute a new GTK and install it alongs
          MIC (AP -> Group = broadcast + multicast)