EP3659314

• Telefonaktiebolaget LM Ericssonsince May 1, 2020; EPO record ends Apr 22, 2022

A method performed by an authentication server (14) in a home network (3) of a user equipment (1), UE, for obtaining a subscription permanent identifier, SUPI. The method comprises: - receiving a subscription concealed identifier, SUCI, which comprises an encrypted part in which at least a part of the SUPI is encrypted, and a clear-text part which comprises a home network identifier and an encryption scheme identifier that identifies an encryption scheme used by the UE to encrypt the SUPI in the SUCI, - determining a de-concealing server (19) to use to decrypt the encrypted part of the SUCI; - sending the SUCI to the de-concealing server (19), and - receiving the SUPI in response. Methods performed by a UE and a de-concealing server are also disclosed. Furthermore, UEs, de-concealing servers, authentication servers, computer program (133) and a memory circuitry (12) are also disclosed.

From the international application WO2019020439