One of the key issues in wireless sensor networks is to design efficient and secure group key agreement scheme. The Merkle identity tree is firstly introduced, then an efficient scheme based on Merkle identity tree is proposed. With this scheme, the direct and secure communications between any subgroups without retransmission could be implemented. The security of the scheme can be assured under the complexity assumptions. The detailed analysis of the initialization procedure, subgroup key agreement procedure, group communication procedure and rekeying procedure when membership changes, including joining and leaving, shows that the scheme is efficient in computation and communication cost.
Designing efficient and reliable group key agreement scheme is one of the key issues in wireless sensor networks. An authenticated group key agreement scheme is proposed, which based on ternary tree and short signature using bilinear pairings on elliptic curve. In the proposed scheme, five authenticated two-party and three-party key agreement algorithms are adopted. The security of the group key agreement scheme can be assured under the complexity assumptions. The analysis of the initial agreement procedure, rekeying procedure when membership changes, includes joining and leaving, shows that the scheme is efficient in computation and communication cost.
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