The ANSI X9.17 notarization process can be divided into two procedures:

1. Partial notarization, in which the ANSI key-encrypting key (AKEK) is cryptographically combined with the origin and destination identifiers.
   Note:

   IBM defines this step as partial notarization. The ANSI X9.17 standard does not use the term partial notarization.
2. Offsetting, in which the result of the first step is exclusive-ORed with a counter value. ICSF performs the offset procedure to complete the notarization process when you use a partially notarized AKEK.

This appendix describes partial notarization for the ANSI X9.17 notarization process.