Field SSN
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Supply with standard Drupal 7 field for manage SSN - social security number. Field can be added via GUI or programmatically to any form.
The idea of making separate module is the fact that most countries regulations require to store sensitive data in encrypted format. Having correctly configured any of recommended encryption modules you have out-of-the-box solution to save SSID, credit card numbers, etc.
By default the module is configure to handle numbers like xxx-xx-xxxx, but this can be easily configured to any number format your application need.
