Question: What is the purpose of using the input string with specific parameters FC, P0, and L0 during handovers in a 5G system?
Option 1: To derive KASME from KAMF for security context mapping between 4G and 3G systems.
Option 2: To authenticate User Equipment (UE) during initial attach to the 5G network.
Option 3: To encrypt signaling messages between the UE and the 5G core network.
Option 4: To derive KASME' from KAMF for security context mapping from 5G to EPS at handovers.
Explanation: The correct answer is Option 4 because the input string with specific parameters FC, P0, and L0 is used to derive KASME' from KAMF during handovers in a 5G system, specifically for mapping security contexts from 5G to EPS. This process ensures secure communication between the UE and the network during handover procedures.