Abstract: Data sharing is an important functionality in cloud storage. In this article, The authors show how to securely, efficiently and flexibly share data with others in cloud storage. This paper describes new public-key cryptosystems which 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 text 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. Here they provide formal security analysis of our schemes in the standard model. They also describe other application of our schemes. In particular, this scheme gives the first public-key patient-controlled encryption for flexible hierarchy, which was yet to be known.
Keywords: Data sharing, cloud storage, single key, flexible.
Title: Single Key Based Multiple File Sharing In Cloud Storage
Author: Shilpashree P
International Journal of Computer Science and Information Technology Research
ISSN 2348-1196 (print), ISSN 2348-120X (online)
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