Table 2.

Performance of the CBSC schemes.

Schemes	Signcryption cost	Designcryption cost	Ciphertext overhead
Ours	2e + 3m + 3h	2p + 2e + 1m + 3h	2 | G |
[18]	1p + 1e + 4m + 3h	3p + 1e + 1m + 3h	2 | G|
[20]	1p + 5m + 4h	4p + 2m + 3h	3 | G | +|id|
[21]	2p + 4e + 3m + 3h	3p + 4e + 3h	2 | G | +2 | Z p|