Security as armed guards? Security as risk management (we'll hit upon this one later...)? Security as "protection racket" (OK, this one is a joke... maybe :-))
How about "security as insurance"? Just watch Pete Lindstrom flatten this one: Spire Security Viewpoint: Security <> Insurance: "Sure, insurance is useful. But the implication is that it is okay to do less preventive stuff. I think insurance needs to be treated as a last resort."