DES Key Search Photos
Paul Kocher, the machine's principal designer, displays one of the boards holding 64 custom search microchips. The six cabinets (behind) house 29 boards whose searching is coordinated by a PC.
The machine, shown here running, tests over 90 billion keys per second, taking an average of less than 5 days to discover a DES key.
Over 1800 of these custom microchips, built by AWT, perform the DES key search. Each chip contains 24 search units that test possible keys against dual ciphertexts.