Table 4.

IoMT security requirements and methods.

Security	Confidentiality	Integrity	Availability	Authenticity
Key management methods	Kaushik et al. (2019); Sun et al. (2019); Zhang et al., 2018			Shen et al. (2018); Suresh (2019)
Intrusion detection methods		Hoa (2011); Bostami et al. (2019); Rahman and Mohsenian-Rad (2012)		Meng et al. (2020)
Authentication methods	Sun et al. (2019)	Sun et al. (2019)	Yaacoub et al., 2020); Sun et al. (2019); Rathore et al. (2019)	Xu et al. (2019); Aghili et al. (2019)
Access control methods				Luo et al. (2018); Fahim et al. (2019); Kumar et al. (2017); Mohsin et al. (2019); Hamidi (2018); Hossain et al. (2018); Yang (2018)
Blockchain methods	Niu et al. (2020); Hussein et al. (2018)	Wang et al. (2020); Xia (2017); Daraghmi et al. (2019); Liu et al. (2019); Chen et al. (2019); Shen et al. (2019)		Luo et al. (2018); Yang (2020); Guo et al. (2019); Nguyen et al. (2019); Xu et al. (2019)
Ratio	17%	29%	6%	48%