A Lightweight and Secure Anonymous User Authentication Protocol for Wireless Body Area Networks

Table 7

The comparison of security requirements.

Scheme	I1	I2	I3	I4	I5	I6	I7
Wu et al.’s scheme	√	√	√	√	√	×	√
Shen et al.’s scheme	√	×	√	√	×	√	√
Das et al.’s scheme	√	√	√	×	√	√	×
Liu et al.’s scheme	√	√	√	√	×	√	√
Proposed scheme	√	√	√	√	√	√	√

Note. I₁: replay attack; I₂: impersonation attack; I₃: privileged insider attack; I₄: secure mutual authentication; I₅: message integrity and confidentiality; I₆: user privacy; I₇: loss of device attack.