Sensor Node Registration Phase. S proceeds offline registration with the help of GWN as below: 1. S generates its identity IDS, private key dS and computes the corresponding public key QS = dS P and h(IDS dS). Then, S sends {IDS, QS, h(IDS dS)} to GWN via a non-public channel. 2. After receiving the message {IDS, QS, h(IDS dS)} from S, GWN computes RS = (h (IDS dS) + h (IDS dGWN)) P and sent it to S. GWN publish QS and stores {IDS, QS, RS} into its database. 3. Upon receiving RS from GWN, S stores it into its memory.
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Sources: Privacy Preserving Authentication and Key Agreement Scheme, Privacy Preserving Authentication and Key Agreement Scheme