You've got sensitive data on your laptop, or you don't, but either way you don't want customs agents nosing through it. So you encrypt it twice, mail one key to a trusted friend near your destination, shred that key, use your laptop on the flight with the other key, and shred that key just before customs.
At this point, you will not be able to boot your computer. The only key remaining is the one you forgot in Step Three. There's no need to lie to the customs official; you can even show him a copy of this article if he doesn't believe you.
This idea from, who else,
Bruce Schneier.
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