FPGA's however are not excessively hard to design nor are they 
enormously
 expensive to fabricate. My memory is quite rusty on this but I seem 
to
 recall a non-profit group wanted to attack the distributed.net 
problem
 from a new angle. Rather than using a large number of commodity PC's,
 they had something like 10-15 FPGA's (field programmable 
gate-array's,
 task-specific processors that can be reprogrammed on the fly) with 
very
 specific instruction sets on a special PCB that connected directly 
to a
 normal PC (I don't recall how).
EFF's "Deep Crack" was based on FPGAs, and was used to brute-force 
56-bit DES encryption in less than 3 days.  They used similar hard to 
help the distributed.net effort.  See <http://www.eff.org/descracker/> 
for more info.
Sorry, as I understand it Deep Crack was built using ASICs - that's 
pure custom silicon, not FPGAs.  FPGAs are a more recent development 
and are much cheaper than ASIC design, assuming your intended task is 
not excessively complex.
--------------------------------------------------------------
from:     Jonathan "Chromatix" Morton
mail:     chromi(_at_)chromatix(_dot_)demon(_dot_)co(_dot_)uk
website:  http://www.chromatix.uklinux.net/
tagline:  The key to knowledge is not to rely on people to teach you it.
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