I am testing data masking of information like credit card no's, bank accounts etc.
Data masking or data obfuscation is the process of hiding original data with random characters or data.
What approach/strategy should I use while testing it. The values are not getting masked in Database application.
Example: Credit card no: 5453-4444-5555-7777 will become ****7777... any no of random chars in front of the string?