Skip to main content

Table 1 Comparisons between our protocol and the recently proposed protocols

From: Two-round contributory group key exchange protocol for wireless network environments

  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