Sent by the chip back to the software (contains data and a 2-byte status word, such as 90 00 for success). File Structure Navigation
The software must load unique RSA asymmetric key pairs onto the chip. During a live transaction, the chip uses its private key to sign a random number generated by the terminal, proving the card is genuine and cannot be duplicated via simple data copying. Cryptographic Keys Handled: emv x2 2021 smartcard software
To program a card, the software sends a sequence of SELECT commands to target the payment application, followed by specialized STORE DATA or PUT DATA APDUs to write records into the Elementary Files. Step 3: Secure Channel Protocols (SCP) Sent by the chip back to the software