Question: What happens when the Secure Channel Counter (SCC) value in the TRANSACT DATA command reaches the maximum value stored in EFSCCmax, in a USIM with an Application ID in the USIM-RN range?
Option 1: The terminal automatically updates the SCC value to reset the counter.
Option 2: The secure channel is terminated without any further action.
Option 3: The USIM rejects all subsequent TRANSACT DATA commands until the counter is manually reset.
Option 4: The terminal derives new key material using Manage Secure Channel APDU – establish SA – Connection SA.
Explanation: According to specifications, when the transaction count reaches its maximum allowed value, the terminal must initiate a security refresh. This is achieved by deriving new key material for the Connection Secure Association (SA), ensuring continued secure communication without exceeding the predefined transaction limit with the same SA, utilizing the Manage Secure Channel APDU command for establishing a new SA.