Privacy-Preserving Two-Factor Key Agreement Protocol Based on Chebyshev Polynomials

Table 6

Security comparison.

	S1	S2	S3	S4	S5	S6	S7	S8	S9	S10
Fan et al. [22]	Yes	No	Yes	Yes	Yes	Yes	No	Yes	Yes	No
Juang et al. [23]	No	No	Yes	Yes	No	Yes	No	Yes	Yes	No
Sun et al. [24]	No	Anonymity-alone	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No
Li et al. [25]	No	No	Yes	Yes	Yes	Yes	No	Yes	Yes	No
Maitra [27]	No	Medium unlinkability	Yes	No	Yes	Yes	Yes	Yes	Yes	No
Chaudhry et al. [28]	Yes	No	Yes	Yes	Yes	No	#	Yes	Yes	No
Guo et al. [19]	Yes	Anonymity-alone	Yes	Yes	No	Yes	No	Yes	Yes	No
Lin [20]	Yes	Weak unlinkability	Yes	Yes	No	Yes	No	Yes	Yes	No
Lee [21]	Yes	Medium unlinkability	Yes	Yes	Yes	Yes	No	Yes	Yes	No
Irshad et al. [29]	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No
Irshad et al. [30]	No	Medium unlinkability	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Our protocols	Yes	Medium unlinkability	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes

S1: No password table and verification table; S2: User privacy-preserving; S3: Mutual authentication; S4: Contributory property of key agreement; S5: Session key security; S6: Two-factor secrecy; S7: Free updating of password; S8: Resistance to password guessing attacks; S9: Resistance to replay attack. S10: Key confirmation.