http://www.engadget.com/2015/08/22/tsa-reveals-master-baggage-keys/"Security researchers have long
warned of the dangers
of using master-keyed locks -- if thieves get their hands on just one
key, they compromise all of the compatible locks at the same time. And
unfortunately, the US' Transportation Security Administration is
learning this lesson the hard way. It
briefly let the
Washington Post
show a photo (we've blurred the details) of the master baggage keys it
uses for approved locks, giving crooks a crude guide to making
duplicates."