For quite some time, banks and financial institutions have been using people’s Social Security Numbers (SSNs) to verify their identities. Suppose you want to access your bank account to check your balance, change addresses, or close out the account. You call the bank, but how does the bank know it’s really you? For a while, banks were asking you for your SSN. Your SSN was used akin to a password. If you knew this “secret” number, then it must be you. Of course, as I have written about at length, a SSN is one of the dumbest choices for a password. Not only is it a password that can readily be found out, but it is a password that’s very hard to change. Not a wise combination. People’s SSNs are widely available, and the data security breaches in the past two years exacerbated the exposure. A lot of legislative attention has focused on the leakers of the data, and rightly so, but not enough attention has been focused on the businesses that use people’s SSNs as passwords. If SSNs weren’t used in this way, leaking them wouldn’t cause the harm it does.