Table 1.

Summary of related works.

Author	Proposed Scheme	Weakness
Wu et al. [9]	For TMIS using a smart card	Impersonation, insider, offline password guessing attacks
Debiao et al. [10]	Using a smart card and a password	Offline password guessing attacks
Wu et al. [12]	Secure three-factor scheme for wireless sensor networks	User impersonation attacks and no user anonymity
Masud et al. [6]	For IoT-based healthcare	Offline-password, replay, privileged insider attacks