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The authors can now outsource data backups off-site to third-party cloud storage services so as to reduce data management costs. However, they must provide security guarantees for the outsourced data, which is now maintained by third parties. They design and implement FADE, a secure overlay cloud storage system that achieves fine-grained, policy-based access control and file assured deletion. It associates outsourced files with file access policies, and assuredly deletes files to make them unrecoverable to anyone upon revocations of file access policies. To achieve such security goals, FADE is built upon a set of cryptographic key operations that are self-maintained by a quorum of key managers that are independent of third-party clouds.
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