You are conducting an audit of a system that stores credit card data. While reviewing database records you notice the credit card numbers are stored, but with the majority of the digits being replace with periods. (e.g. instead of 5105-1051-0510-5100 it is stored as ....-....-....-5100). What term most accurately describes this scenario?
Tokenizing
Sensitive Data Replacement (SDR)
Data Anonymization
Data masking