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Chapter 6: Diagnostics Specification 6-25
For Master/Session keys report encrypted PIN block as a result of the
encryption with the designated key selected by the index. For DUKPT
keys, the result returned by the designated PIN block is the encrypted
PIN block and the associated KSN (Key Serial Number) that goes along
with the designated encryption key. This information can be used to
verify that the correct key has been injected into the unit.
Key Check Value
Menu Option Description
US
Key Check Value
Pressing
Enter
will select the
displayed menu option.
✎
Note:
Press
Yes
or
No
to
move forward or backward
through the menu options.
Used to verify that the correct
keys are injected into the
appropriate index. The key check
value is defined as the first six
characters of the encrypted result
obtained by encrypting known
data (all zeros) with the
designated key.
Note:
Note: The displayed
result does not reveal any
information about the key that
has been injected but allows the
user enough information to verify
with a high degree of probability
that the correct key has been
injected.
✎
Note: The
NCR 5992
stores
all master keys as double
length keys
Key Check Value
Master 1st Part
Displays the key check value for
the first part of double length
master key.