> Michael Weiner presented a paper at Crypto93 that describes a fast DES key
> search engine that uses a special inside-out DES chip that he designed.
...
> This machine can exhaust the DES key space in 7 hours, finding a key in 3.5
> hours on the average.
While the economics of this machine are impressive, Weiner notes in the same
paper that a two-key triple-DES (essentially, chaining two DES encryptions
together) is estimated to be about 10 trillion times stronger than single-DES.
His $1 million dollar machine would take about four billion years to
crack that, on average.
And a three-key triple-DES is apparently even stronger than that.
