CPACFCentral Processor Assist for Cryptographic Functions (IBM Corp.)
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Enterprise level encryption solutions are centrally managing the encryption keys across all different platforms and then use proprietary logic to invoke CPACF. Point solutions for the mainframe like the IBM Encryption Tool for IMS and DB2 Databases uses the PCIXCC or Crypto Express2 coprocessors to secure the key with the master key, then use proprietary logic to invoke CPACF.
Data Encryption for IMS and DB2 Databases requires OS/390 or z/OS Integrated Cryptographic Service Facility (ICSF), which only runs on processors that support the IBM[R] Cryptographic Coprocessor Feature (CCF) or the CP Assist for Cryptographic Functions (CPACF).
The z990 processor introduced a facility called CPACF, which does not carry the concept of master key and deals only with keys provided in clear ("clear keys").