z/OS Cryptographic Services ICSF System Programmer's Guide
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Special Secure Mode

z/OS Cryptographic Services ICSF System Programmer's Guide
SA22-7520-17

Use of some ICSF services requires that ICSF be in special secure mode: CSNBPGN, CSNBSKI, CSNBSKI2, CSNBSKM, and CSNDSYG with the IM keyword (CCF only).

Note:
On a CCF system, if a PCICC is available and the modulus bit length of the RSA public key is greater than or equal to 512 bits, than special secure mode is not required for CSNDSYG IM form.

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