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

Table 12

Storage space cost.

Item	User	Guard
General scheme	3⋅𝑙𝑁+𝑙𝐾+𝑙𝐸	None
(before registration)	(176 bytes)	(0 bytes)
General scheme	4⋅𝑙𝑁+𝑙𝐾	4⋅𝑙𝑁+𝑙𝐾
(after registration)	(32 bytes)	(32 bytes)
SVA scheme	3⋅𝑙𝑁+𝑙𝐾+𝑙𝐸	None
(no registration required)	(176 bytes)	(0 bytes)