Patent ID: 11863982
Assignee: APPLE INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 18:
19. A non-transitory computer-readable storage medium storing instructions that, when executed by one or more processors of a user equipment (UE), configure to the UE to:
send, to a cellular wireless network entity of a cellular wireless network as part of an attach procedure, an uplink (UL) message that includes a fallback subscription concealed identifier (SUCIFB), when the UE has received an authentication failure indication associated with an initial subscription concealed identifier (SUCI) related to a subscription permanent identifier (SUPI);
receive an authentication success indication from the cellular wireless network entity in response to the UL message; and
establish a secure connection with the cellular wireless network entity,
wherein the fallback SUCIFB is generated by encryption of the SUPI based at least in part on a symmetric fallback encryption key (KFB) or an asymmetric fallback public key (PKFB) provisioned to the UE by the cellular wireless network entity or by another network entity of the cellular wireless network.