Is BYOK the key to secure cloud computing?

Thanks to Edward Snowden’s revelations about the NSA, the comprehensive hacking of Sony, and on-going legal battles over whether email stored in the cloud belongs to the people sending it or the service hosting it, more and more cloud services have moved to encrypt data. Some are going even further, offering Bring Your Own Key (BYOK) options, where the user holds the encryption keys for their own cloud data.Google Compute Engine started offering a preview service for encrypting both data a