name: PEK
full_form: ProSe Encryption Key
context: PDCP protocol and Counter needs to be explained. Editor's note: The exact size of the above parameters requires further study to ensure that the fit with PS needs. If the Counter is about to wrap around in the sending UE then a new PTK Identity is selected (which has not been previously used together with the same PGK and PGK identity in the UE), and a new PTK key is derived from the PGK key taking the new PTK Identity into use. A new PEK is derived from the new PTK key as well. The old PTK key is deleted together with the corresponding old PEK derived from the old PTK key. If the receiving UE receives a PDCP packet with a new PTK Identity that has not been previously used with the same PGK and PGK identity in the receiving UE, then the receiving UE deletes any old PTK key kept for the same PGK and PGK identity and also delete the corresponding old PEK derived from the old PTK key. Editor's note: Its FFS whether the sending UE at UE power off needs to store the PTK Identities that has
description: The ProSe Encryption Key (PEK) is a parameter used in Public Safety (ProSe) communications for encryption. Derived from the Primary Temporary Key (PTK), it ensures secure communication between user equipment (UEs). The PEK is updated when a new PTK Identity is selected or when the Counter is about to wrap around.
explanation: The text describes PEK as a parameter used in ProSe communications for encryption, highlighting its role in securing data transmission. This classification aligns with the definition of a 'Parameter' as a configurable value within a telecommunications system.
section_title: 6.3.5.2.2	Identities
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