Source: http://www.engadget.com/2013/08/16/google-cloud-storage/
There's little doubt Google knows a thing or two when it comes to encrypting its own data, and now the company's kindly sharing some of that cryptographical love. Starting now, data uploaded to the Cloud Storage platform will be encrypted on the server side of things before being uploaded. The company's promised that the added safety won't impact performance, and no additional setup will be needed on your end. Also, once you, the authorized reader, are ready, that data will be auto-transferred and decrypted. The company's also going to start encrypting older data, but that migration is likely to take a few months.
Filed under: Google
Source: Google Cloud Platform Blog