From Nextgov:

“Social Security numbers are so deeply compromised and so widely available to the public…that they can no longer be used as an authenticator,” said Paul Rosenzweig, a cybersecurity expert at the R Street Institute, before the House Ways and Means Subcommittee on Social Security. While he and other witnesses largely agreed the number can still work as a unique government ID, the days of using it to prove someone is who they say are long over.

“Using my Social Security number as an authenticator is as stupid as using the last four letters as my last name as authenticator, or the last four digits of my phone number,” said Rosenzweig.

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