http://www.perlmonks.org?node_id=834090


in reply to Creating a rainbow table for a ten-digit number: Advice?

You have a secret database that will give anyone the means to reverse the hash to the original. Then why make the fuss with the rainbow table? Just store the relation 'hash number'->'important number' directly into that database. In both cases you are only safe as long as the secret database stays secret