z/OS Cryptographic Services ICSF Application Programmer's Guide
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Current Key Serial Number

z/OS Cryptographic Services ICSF Application Programmer's Guide
SA22-7522-16

The current key serial number is the concatenation of the initial key serial number (a 59-bit value) and the encryption counter (a 21-bit value). The concatenation is an 80-bit (10-byte) value. Table 168 shows the format of the current key serial number.

When UKPT or DUKPT is specified, the PIN profile parameter is extended to a 48-byte field and must contain the current key serial number.

Table 168. Format of the Current Key Serial Number Field
BytesDescription
24-47Character representation of the current key serial number used to derive the initial PIN encrypting key. It is left justified and padded with 4 blanks.

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