Interdomain Identity-Based Key Agreement Schemes

Table 3

Performance comparisons in interdomain.

Communication cost	[24]	[18]	[15, 16]	[17]	[19]	[25]	[27]	[26] (1)	[26] (2)	Ours
Round	2	2	≤	1	≤	3	≤	≤	≤	3
Bandwidth	3	3		3		4
Computation cost	[24]	[18]	[15, 16]	[17]	[19]	[25]	[27]	[26] (1)	[26] (2)	Ours
Point addition	9	6						—
Scalar multiplication ()	8	4						—	2
Scalar multiplication ()		—			—	—	—	≤	≤
Pairing	4	4	≤		≤			≤	≤
Exponentiation	—	—		—	—	—	—	—	—	—
Increment/decrement of computation time	↑191%	↑204%	↓89%	↓94%	↓88%	↓89%	↓158%	↓95%	↓92%	—

: the number of TAs.
: the number of users.
: the number of users in the th TA, where .
.