[Retracted] HGKM: An Efficient Hybrid Group Key Management for Unmanned Autonomous Vehicles MBN in Wireless Network Environment

Table 9

The computation cost of join and leave operations in HGKM.

		Computation cost
Join	The TKC
	Members of that immediately affected operation element
	Outside members affected directly by operation unit.	1
Leave	The TKC in Case I
	The TKC in Case II
	Members of that immediately affected operation element
	Newly elected leader of immediately affected member element	2
	Members outside the immediately affected operation element	1

: the highest operation element; : the entire number of members within this leader element; : the entire number of members within this group;