The Department of Homeland Security (DHS) is proposing changes to its Privacy Act regulations, in line with the Social Security Number Fraud Prevention Act of 2017. These changes would restrict the use of full Social Security numbers (SSNs) in documents sent by physical mail unless deemed necessary by the Secretary of Homeland Security. DHS aims to further define what "necessary" means and to ensure that SSNs are redacted whenever possible. The agency also plans safeguards to protect SSNs, ensuring they're never visible on the outside of mail packages.
Simple Explanation
DHS wants to change the rules so that using your full Social Security number in mail is very rare, only when it's really needed, and they want to make sure your number isn't shown on the outside of mail.