I need help with Variable level encryption of SSN. SAS help desk sent me references to two papers. 1) Annette Landan-Effective Data Encryption Algorithm. 2) Sheng Luo-Using Bitwise Function to Scramble Data fields with Key.

The second paper (Luo) does have some interesting method to encrypt credit card # but when I ran it on a test dataset I found that if the record repeated itself it was encrypted differently. And that just wont fly with medical records where the same SSN will have multiple observations.

I did see some Macros on the UGA list serve archives but I was wondering if someone has any updated version of the same or perhaps newer algorithms. If they are FIPS 140 compliant that would be even better.

Thank!!!