I'm vaguely interested in how one could build a coin or a ring to within certain so that its physical shape, as well as it's surface features could be 'read' as data.
We are used to barcodes, magnetic strips, even R.F.I.D. chips, but what about when you specifically don't want your secrets on recognizable media? Build a physical model of something on one end that has to look sort of like Grandma's ring or a ballerina statue, but with an algorithm that varies the model very slightly according to the data you are trying to hide. Then someone else, if you've told them which object to look for, can use a laser scan or something to retreive the info.
I remember seeing a holograph etched into chocolate a while back. A holograph would tip too many people off, but it shows the potential. Imagine someone behind the Great Firewall of China making a few 'improvements' to the factory line. Then he'd just need to get a message through to someone letting them know which type of product to scan, assuming the protocol for encoding and decoding had already been worked out. Millions of edible copies would ensure delivery.
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