Uses of Social Security Numbers in the Private Sector: Why SSNs Are Not Appropriate for Authentication


The SSN has evolved since its establishment in 1935 and implementation in 1936 to be used as both an identifier and an authenticator. 

This morning, we heard from a panel of experts on the use of the Social Security number as an identifier.  As an identifier, the SSN is provided by individuals to answer the question, “Who are you?” As an authenticator, the topic of this panel, the SSN is provided by individuals in response to a challenge: “Prove who you are.”

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