Table 4.

Limitations of ECC based Signcryption Schemes presented for securing WBANs.

Authors and Ref. No.	Publication Year	Limitations
Amin et al. [80]	2014	Affected by certificate related issues such as certificate distributions, certificate revocation, and certificate administration Use ECC with a key size of 160 bits which may incur high computing power consumption and increase bandwidth
Anyembe et al. [81]	2018	Hamper by the requirement of a secure channel for distribution of partial keys from the application provider’s and the controller’s key escrow problem Use ECC with a key size of 160 bits which may incur high computing power consumption and increase bandwidth
Gao et al. [82]	2019	Hamper by the requirement of a secure channel for the distribution of partial private key Use ECC with a key size of 160 bits which may incur high computing power consumption and increase bandwidth