A Provably Secure Three-Factor Authentication Protocol for Wireless Sensor Networks

Table 4

Security comparison.

	Das et al.’s protocol [32]	Chen et al.’s protocol [35]	Wu et al.’s protocol [36]	Our protocol
A1	√	√	×	√
A2	√	√	√	√
A3	√	√	×	√
A4	√	√	√	√
A5	× [34]	√	√	√
A6	× [36]	× [36]	√	√
A7	√	√	√	√
A8	× [34]	√	×	√
A9	× [34]	√	×	√

A1: known session-specific temporary information attacks; A2: user impersonation attacks; A3: sensor impersonation attacks; A4: man-in-the-middle attacks; A5: stolen smart card attacks; A6: off-line password guessing attacks; A7: privileged-insider attacks; A8: perfect forward secrecy; A9: user anonymity. The “√” denotes that this protocol can resist the attack. The “×” denotes that the protocol cannot resist the attack.