Joanna is reviewing her account information on an e-commerce website and sees her credit card number displayed as XXXX-XXXX-XXXX-1234. What type of data obfuscation is in use?

Data masking conceals elements of a data field or entry, preventing all of it from being seen but leaving it accessible through the database when masking is not used. Tokenization replaces values with a reference value—often a hash that can be used to refer to the value without using the actual entry. Hashing is a one-way function that produces an input of arbitrary length. Field encryption is not a common term.