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In addition to credit card encryption and tokenization options for PCI DSS applications, IRI also provides a convenient way to mask all or part of a 16-digit credit card number in database tables and flat files.
The IRI Workbench GUI for FieldShield can automatically mask all but the last 4 digits of the field in any database or flat file. You can also define another character and set of digits to mask in the same dialog:
To create computationally valid PANs for testing, use the IRI RowGen function described here: