The key generator utility program (KGUP) generates and maintains keys in the cryptographic key data set (CKDS). You can use KGUP to generate or supply a key to update the CKDS. KGUP generates keys to use in key exchange with other systems. ICSF provides an exit for customizing KGUP processing. For information about using KGUP to managing cryptographic keys, see z/OS Cryptographic Services ICSF Administrator’s Guide.