The use of then Social Security Number (SSN) as a unique identifier for US citizens causes many problems. Most significantly, it is a identity theft risk when it is exposed, but its widespread utilization means that it must often be revealed. The national CTO should determine a way to defuse the danger of exposing a social security number.

I lived in Denmark for a short time, and they addressed this issue by registering an address with the social security number. Banks and other financial organizations used the address registered with the SSN to communicate with individuals. This had the added benefit of reducing the hassle of changing addresses; you only had to change it in one place.

This will likely be a contentious issue on the basis of privacy issues, but if people are really concerned about it, they can register at a P.O. box.