On Apr 23, 2014, at 10:30 AM, Rafael Copquin <[email protected]> wrote:

> What is a "rainbow table" ?

Sort of a reverse directory. If you take the most common things that people use 
for passwords and hash them with basic techniques, you get a table of values 
that you can then use to look up the original password. Example: let's say 
you're totally lame and use 'password' as your password. The MD5 hash would be 
'5f4dcc3b5aa765d61d8327deb882cf99'

Now if someone gets access to the user info tables, and sees a user whose 
hashed password is '5f4dcc3b5aa765d61d8327deb882cf99', you know their original 
password.


-- Ed Leafe



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