There's a very interesting point of view in this article about the [security of LastPass][1].

I think there are easier methods of hacking your passwords than to try to breach LastPass's encryption. For example keyboard logging. If you really think that your credentials are in danger or being hacked, you should use a clean linux computer. Choose a really hard password (24 characters?).


  [1]: http://foliovision.com/2013/11/lastpass-nsa-security