Which data masking function to use to mask bank account numbers?
An IBAN number is composed of several elements.
Here is the terminology used for the data masking functions:
Black: Country code
Coral: Check digits
Light blue: Bank/branch code
Dark blue: Account number
Gray: National check digits. Their position in the IBAN number
depends on the country.
Some countries do not use national
check digits.
To mask bank account numbers
by other bank account numbers, you can use different data masking functions. To help you
decide which function is the most suitable, the following table sums them up:
Function
Generate account
number and keep original country
Mask account number
and keep original country
Behavior
Input valid*: Generates bank account
numbers conform to the corresponding country
Input not valid*: Generates French IBAN
numbers
Uses the format-preserving encryption
Input valid*: Masks the bank account
number
Input not valid*: Sends the input data to
the "Invalid" flow or returns null in the main flow
* To determine if an
input is valid, the functions verify different criteria.
Input
validation1
Valid length
Valid format
Valid IBAN check digits
Valid national check digits
2
Output
validity1
Valid format
Valid IBAN check digits
Valid national check digits
2
2
Valid bank/branch code
1 According to the
country code
2 For French and Monegasque IBAN
numbers. For other countries, the national check digits may not be
valid.
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