Scalable Data Sharing In Cloud using Public Key Cryptosystem

Madeti Mohana Krishna Kumar, S Madhri


Data sharing is an important functionality in cloud storage. We show how to securely, efficiently, and flexibly share data with others in cloud storage. We describe new public-key cryptosystems that produce constant-size cipher text such that efficient delegation of decryption rights for any set of cipher text is 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. The secret key holder can release the constant-size aggregate key for the flexible choices of cipher text set in cloud storage, but 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.



Cloud storage, data sharing, key-aggregate encryption, Public Key Encryption.


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