of MSs

\*This shows the trade-off among communication, computational overheads.

**Table 3.** Summary of the main performance parameters of rekeying algorithms

MBRA[3] not supported Very weak Non optimal Xu et al.[18] Supported weak Non optimal GKDA[20] supported good Non optimal

Chakraborty et al.[23] supported good Non optimal Kambourakis et al.[19] supported good Non optimal

ELAPSE [21] supported good Non optimal Brown et al.[24] supported good Non optimal

SRA[25] supported Very good Near optimal

*Secrecy Scalability & 1-affects-n* **Operational efficiency\***

**Figure 17.** Unicast messages in ELAPSE and SRA
