MHCOOS: An Offline-Online Certificateless Signature Scheme for M-Health Devices

Table 3

Performance comparison-communication cost.

Scheme	Signing		Verification
	Offline	Online
L-OOCLS/HRAAP [9]	3M + 1Exp	3M	1P + 1Exp + 1M
MHCOOS scheme	2M	2M	2P + 1Exp
Liu et al. [10]	—	1P + 1Exp + 2M	2P + 1Exp
Kumar et al. [11]	—	3M	3P + 1M
Hafizul Islam and Biswas [8]	—	3P + 3M + Exp	1P + 1M + 1Exp
Selvi [12]	3M	—	6M + 4P