There are lots of ways of keeping your data secure, from hiding it under your mattress all the way up to sophisticated encryption techniques. But your data is still all there, somewhere in some form, and someone who's determine enough could eventually find or crack it. Unless you have a Cloud Shredder, that is.
The Cloud Shredder is an extraordinarily simple concept: split your data into two parts. Keep half on your computer, and half somewhere in the cloud. When you want to access your data, just get online, and the cloud half will be seamlessly combined with the half on your computer and you're good to go. You don't have to have any faith in the security of cloud storage, since they never have all of your data. And similarly, if your computer gets jacked, you can just delete the cloud data to virtually "shred" everything on your computer.
The downside, of course, is that there are several different ways for you to get screwed by this system: if you lose half of your data for any reason, the other half is utterly unrecoverable. And if you're ever without internet access, you're out of luck. But the concept is potentially extendable to different systems; like, replacing the cloud with a thumb drive, or even adding a thumb drive into the mix of cloud and computer if you're super paranoid and want to add a third piece to the puzzle.
The Cloud Shredder will work with just Adobe Acrobat and Open Office when it's first presented later this month, but there's no reason why it shouldn't eventually be able to work with any sort of data that you're prone to freak out about.
Via New Scientist