z/OS Cryptographic Services ICSF Application Programmer's Guide
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Deriving the EMV TDESEMVn tree-based session key

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

In the diversified key generate and PIN change/unblock services, the TDESEMV2 and TDESEMV4 keywords call for the creation of the session key with this process:

  1. The intermediate key is obtained as explained above for the TDES-XOR process.
  2. Combine the intermediate key with the two-byte Application Transaction Counter (ATC) and an optional Initial Value. The process is defined in the EMV 2000 Integrated Circuit Card Specification for Payment Systems Version 4.0 (EMV4.0) Book 2 Book 2, Annex A1.3.
    • 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.

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