Bruce Schneier helps a friend build a crypto system for his wedding rings, and is asking for help determining their most effective use.
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(http://www.schneier.com/blog/archives/2008/09/contest_cory_do.html)
Cory Doctorow wanted a secret decoder wedding ring, and he asked me to help design it. I wanted something more than the standard secret decoder ring, so this is what I asked for: "I want each wheel to be the alphabet, with each letter having either a dot above, a dot below, or no dot at all. The first wheel should have alternating above, none, below. The second wheel should be the repeating sequence of above, above, none, none, below, below. The third wheel should be the repeating sequence of above, above, above, none, none, none, below, below, below."
Full Story (http://www.schneier.com/blog/archives/2008/09/contest_cory_do.html)
Ideas Here (http://www.boingboing.net/2008/09/05/help_design_a_cipher.html) (must read full story first)
Ehtyar.