Well for most of the cases where science says things are implausible it's cos we already have a law or a thoroughly accepted theory as to why, it's just that, like in your cryptography example, not everyone is aware of all of them. So most people[1] know about light speed and that you can't make things completely invisible, but when the media goes on about quantum teleportation and the like, that makes it harder.
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timeasmymeasure
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Date: 2010-01-26 05:08 pm (UTC)[1] OK, maybe that's wishful thinking