How to Spot a Fake Census Worker: Via Schneier on Security.

This apparently non-ironic video warns that people might impersonate census workers in an effort to rob you. But while you shouldn't trust the ID of a stranger, you should trust that same stranger to give you a phone number where you can verify that ID. This, of course, makes no sense.

Preventing impersonation is hard.

Read Original Article:(Via Schneier on Security.)