unforgeable optical tokens?

eli+ at zimbs4.srv.cs.cmu.edu eli+ at zimbs4.srv.cs.cmu.edu
Sat Sep 21 02:33:40 EDT 2002


Perry E. Metzger wrote:
> An idea from some folks at MIT apparently where a physical token
> consisting of a bunch of spheres embedded in epoxy is used as an
> access device by shining a laser through it.

I can't dig up the memory, but I think I heard of a similar idea --
random structure in transparent solid, difficult to copy -- used in
some kind of tag or seal for nuclear security.  Can anyone remind me
what this might have been?

-- 
     Eli Brandt  |  eli+ at cs.cmu.edu  |  http://www.cs.cmu.edu/~eli/
    (finished Ph.D., woohoo; looking for good work in the Seattle area)

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