Question: What is a crucial requirement for the Terminal in the context of establishing a shared key (Ks_local) with a Universal Integrated Circuit Card (UICC)?
Option 1: The Terminal must support multiple UICC profiles simultaneously.
Option 2: The Terminal's operating system must be open-source for verification.
Option 3: The Terminal shall be trusted, potentially adhering to specific trusted platform specifications.
Option 4: The Terminal is required to have a minimum storage capacity of 128 GB.
Explanation: Trust in the Terminal is essential to ensure the security and integrity of the shared key (Ks_local) establishment process between the UICC and the Terminal. This trust requirement implies that the Terminal must meet certain standards or specifications that guarantee its reliability and security, such as those defined in trusted platform specifications, to prevent unauthorized access or misuse of the shared key.