The KSI is the first few bytes of the KSN and can be used to identify the key.
First, send the 81-0A NEO command with data 05 to retrieve the data encryption KSN first following the steps shown in the screenshot below. The KSN (in hex) is in the Results window as highlighted.
Next, convert the KSN hex string to ASCII that is FFFFFF02000000000004 for the sample string in the screenshot. Then check the first few bytes of the KSN with the desired KSI to identify the key.
Use dData 02 for RKI-KEK, data 03 is MAC DUKPT key (for SRED device)
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