[freehunter]

As an information security professional, I am so glad we use RFID badges. I want to know who is getting into my secure datacenter and when, and be able to revoke that right with the click of a button if things start going pear-shaped with their activities.

[betterunix]

...because as we all know, an RFID badge is so terribly difficult to clone.

[freehunter]

RFID is a broad spectrum, not necessarily one technology. Some are more secure than others. Even with the most basic, though, it's pretty easy to clone a key or a keycode as well. Keys can't be revoked if you don't know where they are, and keycode changes require everyone to learn the new keycode. It's a game of give and take.