> So you can download a db of MD5 hashes of all 6
> character strings with a character space of A-Za-z0-9 for instance.

Usually you just by a hard drive pre loaded with the DB.  $300 to $1000 will 
get you the fruit of months/years of someone else's work-- a database or 
series of databases ranging from GBs to TBs.
I tried to create some rainbow tables of SHA-1 hashes once as an experiment. 
It was slow as heck, and I didn't get past 5 character alpha/numeric 
combinations before I already had 4 Gigs of data and it was growing 
exponentially.

A 20 character salt of special characters like Judah suggested will 
generally put the number of possible hashes into the stratosphere and 
effectively rule out brute force.

Social engineering is sadly MUCH easier.  Have you ever called up your ISP 
to have them reset an account password only to hang up and realize they 
didn't ask you a shred of verification information?
You can't overlook those kind of weak links either when it comes to 
security.

~Brad 


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