CompTIA Data+ DA0-002 (V2) Practice Question

Using a deterministic one-way hash (or similar tokenization approach) on customer identifiers converts each value into an irreversible surrogate that is identical every time the same input appears. This keeps PII out of the file while still allowing the vendor to join rows that refer to the same shopper. Encrypting the entire file and then handing over the key simply reveals the raw PII once it is decrypted. Aggregating the data removes the ability to link individual shoppers across days, preventing the required analyses. Partially masking names or card numbers leaves enough of the original values to risk re-identification and still exposes other direct identifiers such as email addresses.