[Cryptography] Proving a Negative (was MAybe he's Adam Back, maybe not)

[Peter Wayner]

This reminds of going through the customs in the UK. They wanted to know
where I was staying. I just said, "I don't know." Whoops. They only wanted
positive information. In this case, null information sets off alarm bells.
But I didn't know because I had stored it on my phone. But they insisted
that I leave my phone off because turning it on could be some really bad
thing.

So we went back and forth for a bit as I tried to convince them that I
wasn't flying into London to live as a homeless person on the streets.
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