SF-LAP: Secure M2M Communication in IIoT with a Single-Factor Lightweight Authentication Protocol

Table 3

Paper’s notations and description.

Notation	Description
	Preshared key
	Sensor
	Controller
	Authentication server
	Identity of
	Identity of
	Message
	Nonce of
	Nonce of
	Nonce of
	Nonce revoke
h	Hash function
||	Concatenation
⊕	operation
	Encrypted message with session key
	Timestamp
	Private key
	Session key