Anonymous Authentication and Key Agreement Scheme Combining the Group Key for Vehicular Ad Hoc Networks

Table 2

Features comparison.

Feature	LIAP	NECPPA	Wu et al.	Our scheme
Using bilinear paring operation	Yes	Yes	No	No
Using ideal TPD	Yes	Yes	No	No
Requiring TA to participate in certification	Yes	Yes	Yes	No
Searching database	Yes	Yes	Yes	No