Social Security Numbers:

Use is Widespread and Protection Could Be Improved

GAO-07-1023T: Published: Jun 21, 2007. Publicly Released: Jun 21, 2007.

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Since its creation, the Social Security number (SSN) has evolved beyond its intended purpose to become the identifier of choice for public and private sector entities, and it is now used for myriad non-Social Security purposes. This is significant because a person's SSN, along with name and date of birth, are the key pieces of personal information used to perpetrate identity theft. Consequently, the potential for misuse of the SSN has raised questions about how private and public sector entities obtain, use, and protect SSNs. Accordingly, this testimony focuses on describing the (1) use of SSNs by government agencies, (2) use of SSNs by the private sector, and (3) vulnerabilities that remain to protecting SSNs. For this testimony, we primarily relied on information from our prior reports and testimonies that address public and private sector use and protection of SSNs. These products were issued between 2002 and 2006 and are listed in the Related GAO Products section at the end of this statement. We conducted our reviews in accordance with generally accepted government auditing standards.

A number of federal laws and regulations require agencies at all levels of government to frequently collect and use SSNs for various purposes. For example, agencies frequently collect and use SSNs to administer their programs, link data for verifying applicants' eligibility for services and benefits, and conduct program evaluations. In the private sector, certain entities, such as information resellers, collect SSNs from public sources, private sources, and their customers and use this information for identity verification purposes. In addition, banks, securities firms, telecommunication firms, and tax preparers engage in third party contracting, and consequently sometimes share SSNs with their contractors for limited purposes. Vulnerabilities persist in federal laws addressing SSN collection and use by private sector entities. In particular, we found variation in how different industries are covered by federal laws protecting individuals' personal information. For example, although federal laws place restrictions on reselling some personal information, these laws apply only to certain types of private sector entities, such as financial institutions. Consequently, information resellers are not covered by these laws, and there are few restrictions placed on these entities' ability to obtain, use, and resell SSNs for their businesses. Vulnerabilities also exist in federal law and agency oversight for different industries that share SSNs with their contractors. For example, while federal law and oversight of the sharing of personal information in the financial services industry are very extensive, federal law and oversight of the sharing of personal information in the tax preparation and telecommunications industries are somewhat lacking. Moreover, in our Internet resellers report, several resellers provided us with truncated SSNs showing the first five digits, though other information resellers and consumer reporting agencies truncate SSNs to show the last four digits. Therefore, because of the lack of SSN truncation standards, even truncated SSNs remain vulnerable to potential misuse by identity thieves and others. While we suggested that the Congress consider enacting standards for truncating SSNs or delegating authority to the Social Security Administration or some other governmental entity to do so, SSN truncation standards have yet to be addressed at the federal level.

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