To generate personal identification numbers, call the Clear PIN Generate or Encrypted PIN Generate callable service. Using a PIN generation algorithm, data used in the algorithm, and the PIN generation key, the Clear PIN generate callable service generates a clear PIN and a PIN verification value, or offset. The Clear PIN Generate callable service can only execute in special secure mode. For a description of this mode, see Special Secure Mode. Using a PIN generation algorithm, data used in the algorithm, the PIN generation key, and an outbound PIN encrypting key, the encrypted PIN generate callable service generates and formats a PIN and encrypts the PIN block.