Rainbow Hash Cracking  —  The multi-platform password cracker Ophcrack is incredibly fast.  How fast?  It can crack the password “Fgpyyih804423″ in 160 seconds.  Most people would consider that password fairly secure.  The Microsoft password strength checker rates it “strong”.

Source:   Coding Horror

Author:   Jeff Atwood

Link:   http://www.codinghorror.com/blog/archives/000949.html