I admit that my example is flawed for a few reasons and autoindex is another in that list. While obscurity and security are not identical by any means, and ther

I admit that my example is flawed for a few reasons and autoindex is another in that list. While obscurity and security are not identical by any means, and therefore not semantically equivalent in general, I'm just pointing out how the "something you know" factor inherently utilizes what common ground they do share, whether you call it a secret, a key, a password, a URL with a long random portion.