Question: What is the primary purpose of using a Lawful Interception Identifier (LIID) with alphanumeric characters in the context of handover interfaces for Lawful Interception (LI)?
Option 1: To uniquely identify and correlate target identities across different Law Enforcement Agencies (LEAs) while maintaining confidentiality.
Option 2: To simplify the process of intercepting multiple target identities simultaneously without LEA distinction.
Option 3: To encode the lawful authorization reference number and issuance date for direct access by all parties involved.
Option 4: To standardize the formatting of interception warrants for easier storage within CSP databases.
Explanation: The correct answer, Option 1, highlights the dual purpose of LIIDs: (1) **Unique Identification and Correlation** - ensuring that each target identity (or a group related to the same target) is distinctly identifiable, especially when multiple LEAs are involved. (2) **Maintaining Confidentiality** - by using indirect identification (LIID), knowledge about specific targets is limited to authorized CSP personnel and the respective LEA, enhancing privacy and security. This aligns with the 3GPP specification’s emphasis on using LIIDs for identification and correlation purposes at handover interfaces while keeping target information confined.