Learn how to apply dynamic masking with postgresql-anonymizer to protect sensitive data while keeping database usability intact. Our PostgreSQL Support Team is always here to help you.

Dynamic Masking with PostgreSQL-Anonymizer for Real-World Data Protection

Protecting sensitive information is no longer optional. With regulations like PCI-DSS in place, organizations must ensure personal data stays private, evenwhen shared for development or analytics. One effective approach is dynamic masking with postgresql-anonymizer, a PostgreSQL extension designed to hide or replace sensitive data in real time without breaking database usability.

Understanding Data Masking

Data masking replaces real values with realistic alternatives, allowing systems to operate normally while preventing unauthorized access to actual data. This is particularly useful for healthcare, finance, and other industries handling critical records.

Dynamic masking with postgresql-anonymizer lets you define rules that control how data is displayed to specific roles, keeping production data safe while still functional for testing or analysis.

Setting It Up in PostgreSQL

• Configuring PostgreSQL for Masking

First, configure your PostgreSQL system for masking. You’ll also want to create a user for secure backups, and then create a masked backup to share with developers.

• Roles in PostgreSQL

In PostgreSQL, a role can be a single user or a group of users. Roles control database privileges and can be created through SQL commands or pgAdmin.

Example command to create a masking role:

CREATE ROLE Role1; COMMENT ON ROLE Role1 IS 'MASKED';

• Applying Masking to a Table

Suppose we have a table patient with columns id, name, and phone. Viewing all data normally is simple:

SELECT * FROM patients;

Now, let’s mask the name column using a random name function from the anon extension:

COMMENT ON COLUMN patient.name IS 'MASKED WITH FUNCTION anon.random_name()';

This replaces the real name with an anonymous one when the masking role is active.

• Partial Masking on Phone Numbers

To partially hide phone numbers, showing only the first and last two digits:

COMMENT ON COLUMN patient.phones IS 'MASKED WITH FUNCTION anon.partial (phones, 2, $$*-***-**$$, 2)';

• Testing the Mask

Viewing as a normal user:

SELECT * FROM patient WHERE id = '3';

All original data will appear.

Viewing as a masked user:

SET ROLE role1; SELECT * FROM patient WHERE id = '3';

The name “ROBERT JAMES” might now appear as “sheetle,” and the phone number will be partially hidden.

• Restrictions with Masking Role

Searching for masked data will return no matches:

SET ROLE role1; SELECT * FROM patient WHERE name ILIKE 'sushi Azaar';

Applying delete with the role will also fail:

SET ROLE role1; DELETE FROM patient WHERE id = '3';

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Conclusion

By using dynamic masking with postgresql-anonymizer, you can meet compliance requirements, protect privacy, and still keep your database useful for development or analysis. This method ensures sensitive data is only visible to those who need it, while others see masked or partial values.

In a world where data leaks can damage trust overnight, smart masking isn’t just an option,it’s a safeguard.