Change your LinkedIn password now!  According to an article on CNN, over 6 million LinkedIn passwords were stolen by Russian hackers.  LinkedIn also confirmed in their own blog post that some of the posted passwords did match LinkedIn accounts. According to the story: “The 6.5 million leaked passwords were posted Monday on a Russian online forum, camouflaged with a common cryptographic code called SHA-1 hash. It’s a format that’s considered weak if added precautions aren’t taken. Roughly half of the “hashed” passwords have already been decoded and posted online in human-readable text.”  You can read more about how Hashes are cracked using Rainbow tables in the awesome post here.