Table 7.

The communication cost for the proposed protocol and some other related shared secret protocols.

The Shared Secret Protocols	Sent Messages from G.M (Dealer) during Key Reconstruction	Sent Messages from Participants Vehicles	Received Messages at Participants Vehicles
Shamir Secret [11]	$n$	$t-1$	$t$
Liu et al. [29]	$n$	$2\left(t-1\right)$	$2(t)$
The proposed	$n+1$	-	2

Note: $t$ represents the required secret shares to recover the key.