Table 6.

IoMT privacy methods.

Focus Area	Security Requirements	Reference	Privacy Method
Data	Confidentiality	Ting et al., 2020	Two party secure computation protocol
		Luo et al. (2018)	SW-SSS
		Kumar et al. (2017)	Biometric based authentication scheme
		Hassan et al. (2019)	Using Public and Private keys
		Dwivedi et al. (2019)	Proof of Authority, Public Key
Sensor	Resilience to internal attacks	Liu et al. (2019)	MediBchain Nodes Registration
		Kumar et al. (2017)	Biometric based authentication scheme
Cloud	Trust	Liu et al. (2019)	Medical blockchain (MediBchain)
Network	Resistance to man-in-the-middle attack	Liu et al. (2019)	MediBchain
		Hassan et al. (2019)	Privacy preserving strategies of blockchain-based IoT system
End User	Device Authentication	Liu et al., 2019	MediBchain Nodes Registration
	User Authentication	Liu et al. (2019)	MediBchain-Based Privacy-Preserving Mutual Authentication (MBPA)
		Kumar et al. (2017)	Biometric based authentication scheme
		Dwivedi et al. (2019)	Using Public Key and Lightweight Digital Signature
	Patient Anonymity	Hassan et al. (2019)	Removal of Personally Identifiable Information before data publishing
		Dwivedi et al. (2019)	Lightweight Ring Signature
		Yasaka et al. (2020)	Anonymized graph of interpersonal interactions
Administration	Access Control	Kumar et al. (2017)	Biometric based authentication scheme
		Liu et al. (2019)	MBPA
		Dwivedi et al. (2019)	Using Public Key and Lightweight Digital Signature
	Key Management	Luo et al. (2018)	Public-key cryptosystem
	Trust Management	Liu et al. (2019)	MBPA