Re: SSN encryption
tomstdenis_at_gmail.com
Date: 09/29/05
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Date: 29 Sep 2005 05:42:30 -0700
drfremove@nber.org wrote:
> We want to encrypt social security numbers in a database. The special
> requirement is that the same SSN should encrypt to the same value
> regardless of context. That way when new records are added to the
> database it will be possible to easily match them to existing records.
> Also, the tables can be sorted or selected and still matched to other
> tables in the database.
Use ... a ... salt [and not a known fixed key]!!!
SSNs are like what 10 digits? that's a 33-bit number... fill the
remainder of the bits with random data and encrypt, voila 128-bit
"token" which when decoded gets you a SSN.
Tom
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