Authenticated Blind Issuing of Symmetric Keys for Mobile Access Control System without Trusted Parties

Table 9

Cost of Registration.

Item	User	Guard
Computational cost	𝑇𝑋	2⋅𝑇𝑋+𝑇𝐷+5⋅𝑇𝐶
Communication cost	4⋅𝑙𝑁+𝑙𝐸	𝑙𝑁+𝑙𝑊
	(164 bytes)	(132 bytes)
Transaction number	1	1