Review of ▇▇▇▇ et al Clause Samples

Review of ▇▇▇▇ et al s Scheme‌ In this section, we describe ▇▇▇▇ et al.’s authentication scheme [28]. Three communication parties comprise a user Ui, a gateway node GWN, and a sensor node Sn. This scheme is composed of four phases: registration, login, verification, and password change. We describe each phase in detail, and Figures 1–3 also illustrate ▇▇▇▇ et al.’s scheme. Additionally, we describe the information on the sizes of all transmitted messages in the login and the verification phases. In order to compute the message size, based on [23], we set that both the block size of the symmetric encryption (Ek, Dk) and one-way hash function h(·) are 20 bytes long, the identity IDi and password PWi are 8 bytes, the random number b is 16 bytes, and the timestamp T1–T4 are 19 bytes long.