We love new ideas in the field of rings, it's a bit of a geeky obsession with us, so we were thrilled to see Cory Doctorow's crypto-decoder wedding rings - he and his wife have one each and can send coded messages to each other in the manner of 1950's childrens spy kits.
I've just been having an enjoyable friday afternoon chat with a couple of our goldsmiths about how you would make them. Ryan and Deborah were completely unphased by the idea and have already made a pair of kinetic rings with one rotating band - apparently three rotating rings would be just as possible.
The hard part is the cryptographic applications - luckily Cory has one of the most popular blogs on the internet, Boing Boing, and has thrown it open to the floor as a competition judged by Bruce Schneider, one of the gods of modern cryptography. See his post about it here.
My favourite comment so far - "I imagine spending 10 minutes feverishly decoding a request to take out the goddamn garbage like I asked you this morning". The joy of married life!
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