HOWTO: Auto-create a cryptic URL Path

How Do I: When creating a new node, auto-create a cryptic URL path, similar to a "Replication ID" (like this: www.thesite.com/C560E5B2-6459-478C-A913-4C895D7D046C). Can I do this with some special token?

Scenario: I am asking local school parents to submit certain information using a custom content type. Rather than force user login for security (which a lot of them won't hassle with it), I want to auto-create a really cryptic URL path for the content they create, so that others can't guess it. But I also want to allow anonymous visitors to access the node, if/when I send them the cryptic URL.

Thanks for your advice.