A customer service representative needs to verify a customer's private information, but the representative does...

Data masking is a privacy-preserving technique that replaces sensitive fields with obfuscated or partial values while retaining usability. For example, displaying only the last four digits of a Social Security Number or credit card number. This allows a representative to verify identity without accessing the full data set.

Hashing and encryption protect data at rest or in transit, but they do not allow selective partial display. Tokenization substitutes sensitive data with unique tokens but is typically used for storage and processing rather than interactive verification. Masking, on the other hand, is specifically designed for scenarios where a user must work with limited but recognizable data.

By using masking, organizations enforce the principle of least privilege, reduce exposure of sensitive information, and align with privacy standards such as PCI DSS and GDPR.