Security theater: Some measures just for show

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It’s called “security theater:” highly visible measures that serve no genuine security purpose. Those National Guard troops you see at the airport? Generally those big guns aren’t loaded. Having to show one's ID at every turn? The 9/11 hijackers carried genuine drivers licenses, too. The Takeaway talks to the man who coined the phrase “security theater” about what makes genuinely good security and what's just for show.Guest: Bruce Schneier, chief security technology officer for British Telecom