NEO 2 Interface Developer’s Guide
Copyright © 2019, International Technologies & Systems Corporation. All rights reserved.
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Tag DFEF4D
If tag DFEF4B is set, tags DFEF4D will appear in transaction output.
This variable-length tag contains track and/or PAN data, encrypted. The exact contents will
vary depending on values supplied previously in DFEF4B (see above).
The track data will present track data if it is a MSD transaction, present track Equivalent data if
it is a EMV transaction.
When TDES or AES encryption have been used in conjunction with traditional DUKPT, decrypt
the data normally, using the 10-byte KSN found in tag DFEE12.
After one of Track1 Data, Track2 Data, and Tag 5A is presented,
1) Tag DFEF4C will provider the length of Track and PAN in Tag DFEF4B
2) Tag DFEF4D providers the data of Track and PAN in Tag DFEF4B