A Flexible Crypto Mechanism for Secure Sharing In Cloud Environment

Cloud Computing is a big buzz word in todays technology uplift, storage of data in distributed network has been re-defined in the cloud environment and sharing the data stored is an important aspect of cloud storage systems which has raised many eyebrows with its security policies. In this paper, we present an flexible modelled crypto mechanism that produce constant-size cipher texts such that efficient delegation of decryption rights for any set of cipher texts are possible. The novelty is that one can aggregate any set of secret keys and make them as compact as a single key, but encompassing the power of all the keys being aggregated. In other words, the secret key holder can release a constant-size aggregate key for flexible choices of cipher texts set in cloud storage, but the other encrypted files outside the set remain confidential. This compact aggregate key can be conveniently sent to others or be stored in a smart card with very limited secure storage. We provide formal security analysis of our schemes in the standard model. We also describe other application of our schemes. In particular, our schemes give the first public-key patient-controlled encryption for flexible hierarchy, which was yet to be known.