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Mask Credit Card and keep bank

This function masks valid credit card numbers and keeps the Bank Identification Number/Issuer Identification Number (BIN/IIN). The output value is a valid credit card number.
This function:
  • keeps the first six digits,
  • masks the other digits and
  • generates the last digit using the Luhn algorithm.

Two methods are available: FF1 with AES and FF1 with SHA-2. This function requires no alphabet and no extra parameter.

In the following example, the Keep format check box is selected to preserve the space from the input value.

Credit card number Method Example of masked value

4570 5624 6978 6793

FF1 with AES

4570 5678 2786 4430


FF1 with AES



FF1 with SHA-2



FF1 with SHA-2


0123 4567 8987 6543 210 FF1 with AES null

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