ENCRYPTN start option


   .-ENCRYPTN--=--YES---------.   
>>-+--------------------------+--------------------------------><
   '-ENCRYPTN--=--+-YES-----+-'   
                  +-NO------+     
                  |     (1) |     
                  +-CCA-----+     
                  +-CUSP----+     
                  +-24------+     
                  '-31------'

Notes:

ENCRYPTN=CCA needs to be coded when Triple Des Encryption is desired.

Specifies that 24-bit capable or 31-bit capable cryptography is installed.

Note: If the ENCRYPTN start option is not specified, VTAM® will determine if cryptography is active and the addressing mode it supports.

ENCRYPTN=YES

Specifies that VTAM supports cryptography and determines the addressing mode at VTAM initialization.

At initialization:

If the currently active cryptographic product supports 24-bit addressing mode, VTAM supports cryptographic products that support 24-bit or 31-bit addressing mode and VTAM I/O buffers are placed in 24-bit storage.
If the currently active cryptographic product supports 31-bit addressing mode, VTAM only supports cryptographic products that support 31-bit addressing mode and VTAM I/O buffers are placed in 31-bit storage.
If no cryptographic product is currently active, VTAM only supports cryptographic products that support 31-bit addressing mode and VTAM I/O buffers are placed in 31-bit storage.

ENCRYPTN=NO

Specifies that VTAM does not support cryptography, regardless of whether or not a cryptographic product is currently active.

ENCRYPTN=CCA

Specifies that VTAM use a common cryptographic architecture (CCA) product to satisfy cryptography requests. If a CCA product is not available at start time the request is rejected and the session fails. VTAM supports this product using 24-bit or 31-bit addressing mode.

Sessions that require TDES24 (Triple DES encryption) will fail if the CCA product is not available. In addition, the start option ENCRYPTN=CCA is required if TDES24 is to be used.

ENCRYPTN=CUSP

Specifies that VTAM use an IBM® Cryptographic Unit Support (CUSP) program product to satisfy a request for cryptographic support. If a CUSP product is not available at start time, the request is rejected and the session fails. VTAM supports CUSP using 24-bit or 31-bit addressing mode.

ENCRYPTN=24

Specifies that VTAM supports cryptography in 24-bit mode. VTAM I/O buffers are placed in 24-bit storage. VTAM uses cryptographic products that support either 24-bit or 31-bit storage addresses.

ENCRYPTN=31

Specifies that VTAM supports cryptography in 31-bit mode. VTAM I/O buffers are placed in 31-bit storage. VTAM only uses cryptographic products that support 31-bit addressing mode. If VTAM receives a cryptography request and the only available cryptographic product supports 24-bit addressing mode, the request fails.