ENCRPREF start option

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   .-ENCRPREF--=--NONE------.   
>>-+------------------------+----------------------------------><
   '-ENCRPREF--=--+-NONE--+-'   
                  '-value-'     

Specifies the prefix to be used for common cryptographic architecture (CCA) key-encrypting key (KEK) labels.

You can change the ENCRPREF value with the MODIFY VTAMOPTS command while VTAM® is running.
ENCRPREF=NONE
Specifies that no prefix is to be used for the common cryptographic architecture (CCA) key-encrypting key (KEK) labels.
Note: The default or the IBM® Integrated Cryptographic Service Facility (ICSF) in CCA and the Transaction Security System (TSS) program product running in PCF mode is no prefix.
ENCRPREF=value
Specifies the 1–8-character prefix to be used for common cryptographic architecture (CCA) key-encrypting key (KEK) labels.
Note: Transaction Security System (TSS) program product running in CCA mode has a configuration data set. The PCF-KEY-PREFIX command specifies the first key label token name (the first 1-8 characters of the key label). The default for PCF-KEY-PREFIX is $$CUSP$$.