K2C: Cryptographic Cloud Storage With Lazy Revocation and Anonymous Access
Security and privacy concerns hinder the adoption of cloud storage and computing in sensitive environments. The authors present a user-centric privacy-preserving cryptographic access control protocol called K2C (Key To Cloud) that enables end-users to securely store, share, and manage their sensitive data in untrusted cloud storage anonymously. K2C is scalable and supports the lazy revocation. It can be easily implemented on top of existing cloud services and APIs - they demonstrate its prototype based on Amazon S3 API. K2C is realized through their new cryptographic key-updating scheme, referred to as AB-HKU.