Optical analog computing?

David Honig dahonig at cox.net
Wed Oct 2 12:54:18 EDT 2002

At 11:25 PM 10/1/02 -0400, R. A. Hettinga wrote:
>I'm at a speech by Terry Essex, CTO of Essex Corp. He worked on optical
>computing at the NSA for a long time.
>"the first computer to crack enigma was optical"

In one of the historical books about crypto, there's a method
described involving punching hollerith cards, stacking them,
and looking through the stack for shared holes.  That would
be a parallel optical NAND gate.  (And Java compatible if you wipe 
up fast enough.)

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