Re: Supercomputing and DES key cracking
From: Peter Trei (ptrei_at_rsasecurity.com)
Date: 12/31/03
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Date: Wed, 31 Dec 2003 15:13:26 GMT
David A. Scott wrote:
> mike4ty4@yahoo.com (mike3) wrote in
> news:1d54b7e4.0312301323.7aa4d604@posting.google.com:
>>unruh@string.physics.ubc.ca (Bill Unruh) wrote in message
>>news:<bsgdfc$m59$1@string.physics.ubc.ca>...
>>>mike4ty4@yahoo.com (mike3) writes:
>>>]Let's see. 1 Deep Crack + 100,000 or so PCs does DES crack in 22
>>>]hours, how 'bout network of all the Government's most powerful
>>>]supercomputing devices devoted full time in 100% secrecy? I bet with
>>>]that they could have it done in only about 45 seconds.
>>>
>>>Deep crack is better. Building dedicated hardware will always be
>>>faster than using general machines. But yes, if you want to protect
>>>your message from NSA using DEs is not a good idea.
>>
>>That's because they can use SUPERCOMPUTERS instead of PCs, right?
>>
> No its because they most likely built specialized boards decades
> ago for the sole purpose of cracking it.
>
> David A. Scott
The bottom line is: single DES is vulnerable to
adversaries willing to sink a few hundred thousand
dollars into the effort. This has been the case for
about a decade.
Single DES is still fairly secure against the sort of
cpu power most private individuals can bring against it,
but not against large groups of such individuals.
Don't use single DES. 3DES still seems good.
Peter Trei
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