User Registration Phase. The registration process is between the GWN and U is as follows: 1. U selects an identity IDU, a private key dU and then gets the public key QU = dU P according to dU. Then, U calculates the registration message MIDU = h (IDU), and sends it to GWN via a non-public channel. 2. After receiving the registration message from U, GWN calculates MU = h (MIDU dGWN) and returns it to U via a non-public channel. 3. U computes MU∗ = MU ⊕ h (IDU dU) and deletes MU.
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Sources: Privacy Preserving Authentication and Key Agreement Scheme, Privacy Preserving Authentication and Key Agreement Scheme