SSNs: Not so unique
Department of Corrections: Recently in my Computerworld column, I suggested that it's a bad idea to use Social Security numbers as unique personal identification numbers "just because they're available and, well, they're unique IDs."
I was wrong -- way, waaay wrong. As several readers wrote to point out, a Social Security number is far from unique.
It turns out that millions of people have been assigned more than one SSN -- more than 4 million by 1973, according to one government report, and probably many more today. (The Social Security Administration's press office just told me that 1,744 people were reassigned SSNs in 2004, 1,679 in 2005 and 1,201 in 2006.)
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