gwern comments on Open Thread, September 1-15, 2012 - Less Wrong
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Maybe you could adapt this implicit memory-based authentication scheme into a board game format similar to Mastermind.
Recognition memory is actually even cooler than implicit memory, I thought, and can contain quite a bit of information (as far as I could tell, working through Shannon's theorem): http://www.gwern.net/Spaced%20repetition#fn63
Dunno how it would work in this setting, though, unless the personalities share visual recognition.