An Efficient ECC-Based Authentication Scheme against Clock Asynchronous for Spatial Information Network

Table 2

Security functionality comparisons.

Security functionality	Proposed	[22]	[21]
Valid mutual authentication	Yes	Yes	Yes
Data confidentiality and integrity	Yes	Yes	Yes
No sensitive tables kept by NCC and user	Yes	Yes	Yes
Perfect session key secrecy	Yes	Yes	Yes
User’s privacy	Yes	Yes	Yes
Protection of the biometric	Yes	No	Yes
Resist offline password-guessing attack	Yes	No	No
Against clock asynchronous situation	Yes	No	No