Jul. 6th, 2009

A nice little report on a nice little analysis of SSNs and how to guess them.  I particularly liked the bit at the end:
"She said many businesses have errantly rely [sic] upon or have moved to redact all but the last four digits of a person's SSN, the very digits that are most unique to an individual." 

So, of course the first 3 digits are based on the zip code from which your application was made (almost certain to be place of birth for those born after ~1988); the middle 2 digits are apparently semi-stable over long periods for a region, and the last four (!) digits are not only FAR too few to be a good hash, but are ALSO the ones most likely to be shown.

*whimper*

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lehser

June 2010

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