Table 1 Comparisons between our protocol and the recently proposed protocols
From: Two-round contributory group key exchange protocol for wireless network environments
| Â | Nam et al.'s protocol[20] | Chuang-Tseng protocol[22] | Our protocol |
|---|---|---|---|
Number of rounds | 2 | 3 | 2 |
Contributiveness property | No | Yes | Yes |
Computational cost of each client | 2Texp + Tmul + T H | 2Texp + 3T H | 2Texp+2T H |
Uni-casting message size sent by each participant | |p| | |p| + |q| | |p| |
Computational cost of the powerful node | (n+2)Texp + nTinv + 2nTmul + T H | (n + 1)Texp + (2n + 1)T H | (n + 1)Texp + (n + 1)T H |
Broadcasting message size sent by the group controller | (n + 1)|p| | n(|p| + |q|) | (n + 1)|p| |
Providing the member dynamic functionality | No | Yes | Yes |
Computational cost for joining (each client) | × | 3T H | 2T H |
Computational cost for leaving (each client) | × | 3T H | 2T H |
Computational cost for joining (powerful server) | × | Texp + (2n + 1)T H | Texp + (n + 2)T H |
Computational cost for leaving (powerful server) | × | Texp + (2n + 1)T H | (n + 1)T H |