Re: Brute Force DES

[Julian Assange <proff@suburbia.net>]

> 
> 
> "Peter Trei" writes:
> > The fastest general purpose, freely available des implementation I'm
> > aware of is libdes. by Eric Young. With this, I can do a set_key in 
> > 15.8 us, and an ecb_encrypt in 95 us/block. That adds up to 
> > about 9,000 keytests/sec (this is on a 90 MHz P5, running NT).
> 
> I'll point out that like most DES implementations, Eric's tries to
> spend a lot of time in key setup to save time later on in
> encryption/decryption. This tradeoff would probably be very different
> if you didn't plan on trying more than one or two blocks of decryption
> after getting a key.
> 
> Perry

90 us is several times longer than 15.


-- 
"Of all tyrannies a tyranny sincerely  exercised for the good of its victims  
 may be the most  oppressive.  It may be better to live under  robber barons  
 than  under  omnipotent  moral busybodies,  The robber baron's  cruelty may  
 sometimes sleep,  his cupidity may at some point be satiated; but those who  
 torment us for own good  will torment us  without end,  for they do so with 
 the approval of their own conscience."    -   C.S. Lewis, _God in the Dock_ 
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