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Table 1 Notations throughout this study

From: Robust IoT-based nursing-care support system with smart bio-objects

Symbol

Definition

di

Intelligent device (i.e. smart bio-sensors or fixed environmental sensors)

gj

Mobile gateway (operated by the nurse or the doctor)

S

The nursing-care server

\(ID_{{d_{i} }}\)

Private identity of di

IDs

Public identity of the nursing-care server S

\(ID_{{g_{j} }}\)

Public identity of the mobile gateway gj

\(AID_{{d_{i} }}\)

One-time-alias identity of di

SID

A set of un-linkable shadow identities SID = {sid1, sid2, …}

Kds

The secret key shared between di and S

Kgs

The secret key shared between gj and S

Trseq

Track sequence number

Nds, Nj, Ngs, Nd, Ng, m

Random numbers

H(.)

Secure one-way hash function, i.e. SHA-3

\(\oplus\)

Bitwise exclusive-or operation

||

Concatenation operation