• Select "Encrypt" to encrypt a PIN into an AES PIN block, or "Decrypt" to extract a PIN from an encrypted block.

• Enter the AES-128 key (32 hex characters / 16 bytes) used for encryption/decryption.

• Enter the PAN (Primary Account Number / card number, 13-19 digits).

• For encryption: Enter the PIN (4-12 digits).

• For decryption: Enter the encrypted PIN block (32 hex characters).

• Click Encrypt or Decrypt to process.

• The result shows the encrypted block (for encryption) or the decrypted PIN (for decryption), along with intermediate clear blocks.