Table 1 Notations and description.

From: Physically secure and fog-enabled lightweight authentication scheme for WBAN

Notation

Description

\(\:{UID}_{{MD}_{ij}}\)

Unique ID of Monitoring Device \(\:{MD}_{ij}\)

\(\:{UID}_{{WBAN}_{j}}\)

Unique ID of WBAN Controller \(\:{WBAN}_{j}\)

\(\:{N}_{{MD}_{ij}}\) and \(\:{N}_{{WBAN}_{j}}\)

Dynamic nonces generated by \(\:{MD}_{ij}\)​ and \(\:{WBAN}_{j}\)​, respectively

\(\:{TS}_{i}\)

Timestamp for freshness verification

\(\:SID\)

Session Identifier

\(\:{K}_{Session}\)

Current session key

\(\:{K}_{Session}^{Prev}\)

Previous session key

\(\:{R}_{{MD}_{ij}}\) and \(\:{R}_{{WBAN}_{j}}\)

PUF-based responses from \(\:{MD}_{ij}\) and \(\:{WBAN}_{j}\)

\(\:MAC\)

Message Authentication Code

\(\:H\left(x\right)\)

Cryptographic hash function