Revisiting a Multifactor Authentication Scheme in Industrial IoT

Table 2

Login and authenticated key agreement phase.

	Insert to card reader. Input , and . Compute , , , , and		Check whether . If so, extract . Compute and . Check whether ; if so, generate a random nonce and timestamps . Compute , , and ,		Check whether . If so, compute , , and Check whether ; if so, generate a timestamp . Compute ,
	Check whether , if so, generate a random nonce and timestamps . Calculate, , ,
			Check whether ; if so, compute , , and . Check whether ; if so, return as . Compute , , and . Generate a temporal identity and timestamp . Compute , , and .		Compute and . Check if ; if so, compute and
	Check whether if so, compute ; check whether ; if so, compute . Check whether ; if so, compute and . Check whether ; if so, the session key is established successfully. Compute . Update with