An Efficient Multi-PKG Online/Offline Identity-Based Encryption Scheme for Wireless Sensor Network

In this paper, we divide large-scale resource-constrained WSN nodes into several domains, split cryptographic operations into heavy operations and the fast lightweight operations, and present an efficient multi-PKG online/offline identity-based encryption scheme for multi-domain WSN. Most heavy computations such as pairing or exponentiation are done in the offline phase for pre-computation without the receiver's identity or the knowledge of the plaintext. Most fast lightweight operations are done in the online phase, together with the plaintext and the receiver's identity. The online encryption is extremely efficient and easy to be implemented on sensor node. We prove the security of our new scheme in the random oracle model. Compared with the existing schemes, our new scheme is more secure and efficient, which is suitable for multi-domain WSN