name: XPK
full_form: XML Protection Key
context: The confidentiality and integrity protection mechanisms defined in F.1.4 rely on a shared XML Protection Key (XPK) to be able to encrypt and sign XML. For connections between the client and the MC Domain, the XPK shall be the 128-bit shared Client-Server Key (CSK) established as defined in clause 9.2.1. The XPK-ID shall be the CSK-ID. For connections between servers inside and across MC Domains the XPK shall be the 128-bit manually provisioned Signalling Protection Key (SPK) established as defined in clause 9.2.3. The XPK-ID shall be the SPK-ID For connections between the KMS and the MC KM client (as described in clause 5.3.3), confidentiality protection shall use the 256-bit TrK as the XPK and the TrK-ID as the XPK-ID. Integrity protection shall use the InK as the XPK and the XPK-ID shall be the InK-ID. The integrity key and confidentiality key for application data protection shall be derived from the XPK as defined in annex F.1.4. The XPK-ID may be listed in the XML to aid
description: The XML Protection Key (XPK) is a shared key used for confidentiality and integrity protection of XML data in various connections within the network, including client-server and server-server communications. It can take different forms such as the Client-Server Key (CSK), Signalling Protection Key (SPK), or derived keys like TrK and InK.
explanation: The context explicitly mentions XPK as a key used for protection mechanisms in XML data, indicating its role as a critical network attribute for operation. This aligns with the definition of a Parameter, which includes identifiers and timers crucial for network operations.
section_title: 9.3.3	Key agreement
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