Abstract: For the openness of wireless channel, establishing pairwise key between sensor nodes is the basis of the secure communication in wireless sensor networks. In most of existing IBE-based key agreement schemes, the pairwise key was established using hate pairing with high energy consuming and time consuming. In this paper, authors proposed a key agreement scheme based on BNN-IBS signature, sensors broadcast the parameters required for establishing pairwise key and compute the key using DifficHcllman key exchange technology. Compared with the IBE-based key agreement scheme, the proposed scheme has patent advantages in energy consuming and time consuming with the same security and scalabihty.

Key words: Wireless sensor network, Key agreement, Identity-based signature