Over the last couple of days, you may have heard about the rather ominous sounding Heartbleed bug -- a bug that affected hundreds of millions of websites, exposing usernames, passwords, encryption keys, and other sensitive data. This bug went undiscovered for two years, meaning it's highly likely that some of your data was exposed, and may have been scooped up by enterprising hackers -- and unfortunately, given the nature of this bug, there's almost nothing you can do about it.