Question: Which of the following methods primarily protects against accidental corruption when ensuring Message Integrity in (U)SIM application toolkit security?
Option 1: Cryptographic Checksum in the Security Header
Option 2: Digital Signature on the Application Message
Option 3: Encryption of the Secured Packet
Option 4: Redundancy Check in the Security Header
Explanation: A Redundancy Check is specifically mentioned as a mechanism that protects against accidental corruption when ensuring Message Integrity. While Cryptographic Checksums and Digital Signatures also ensure integrity, they protect against both accidental and intentional corruption. Encryption is a broader security measure not specifically highlighted for protecting against accidental corruption in this context.