How to encrypt your cloud storage for free
If you want something done right, you need to do it yourself. That may sound like a trite cliche, but the maxim rings true when it comes to securing files that you've stored online: A handful of recent incidents–including breaches of Dropbox and iCloud–underscores the fact that even with built-in encryption and SSL transfers, cloud storage providers can't perfectly ensure the sanctity of your data.
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Story added 25. September 2012, content source with full text you can find at link above.