| CPC H04W 12/041 (2021.01) [H04W 8/18 (2013.01); H04W 12/72 (2021.01); H04W 60/00 (2013.01)] | 11 Claims |

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1. An apparatus comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to:
generate a subscription concealed identifier, SUCI, comprising a protection scheme identifier and a home network public key identifier;
wherein at least one of the following: a part of the protection scheme identifier or a part of the home network public key identifier comprises a version indication of at least one of the following: the protection scheme identifier or the home network public key identifier;
generate the SUCI based on a default version indication and a default configuration of at least one of the following: the protection scheme identifier or the home network key identifier, in response to a received registration reject including the default version indication; and
wherein the default configuration corresponds to a lowest priority or highest index of at least one of: the protection scheme identifier and the home network public key identifier.
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