IBM Computer Hardware 2 User Manual Page 479

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CCA Release 2.54
TDESEMV2 causes processing with a branch factor of 2 and a height of
16.
TDESEMV4 causes processing with a branch factor of 4 and a height of 8.
PIN-Block Self-encryption
In the Secure_Messaging_for_PINs (CSNBSPN) verb, you can use the SELFENC
rule-array keyword to specify that the eight-byte PIN block shall be used as a DES
key to encrypt the PIN block. The verb appends the self-encrypted PIN block to
the clear PIN-block in the output message.
Appendix E. Financial System Verbs Calculation Methods and Data Formats E-19
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