[Cryptography] Secret Handshake problem.

[Joseph Kilcullen]

> Also known as the "Are you also a Soviet Spy?" problem. 

I'm more into game theory and economics than cryptography so I have not 
encountered this problem. However a quick Google got this. I posted it 
because, like you, I'm interested to hear what people have to say about 
this one.

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From: http://www.socialmatter.net/the-compendium/     “Are You Also a 
Soviet Spy”
Refers to the difficult process of finding other reactionaries when 
everyone is very quiet about it. Basically, the protocol is to ask 
plausibly deniable questions that other reactionaries would answer in an 
escalating way until you’re both sure that you’re both reactionaries 
without having to ever put your necks out. This is not cryptographically 
secure, but the stakes aren’t all that high either.
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Interesting (real world) a guy once tried to bluff that he was an IT guy 
but I did not buy the comments he made. Not espionage but same technical 
problem.

J.