Save yourself some hassle. Don't key on SSN.
1) Encryption (and then indexing) becomes harder.
2) SSN's can change, for many reasons. (eg: http://consumerist.com/2008/11/can-i-change-my-social-securi..., data entry error, etc)
1) Encryption (and then indexing) becomes harder.
2) SSN's can change, for many reasons. (eg: http://consumerist.com/2008/11/can-i-change-my-social-securi..., data entry error, etc)
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