SCALABLE DATA SHARING BY USING KEY AGGREGATION

Abstract

In cloud computing, Data sharing is an important functionality in cloud storage. Sharing of data is considered as a challenging security problem. The sharing of the user’s finicky data on a third party cloud server does not guarantee the promised level of security and there is a threat to accommodation user data. We can provide how to securely, efficiently, and flexibly share data with third party or others in cloud storage. We design and describe new type of public-key cryptosystems which produce equable-size encrypted texts such that capable delegation of decryption rights for any set of encrypted texts is possible. The novelty in that provides secured data sharing in cloud storage with the help of keyaggregate. It mean the nova is that one can aggregate any set of secret keys and make them as compact as a single key, the secret key holder can release a equable-size aggregate key for flexible choices of encrypted text set in cloud storage, but the other encrypted files outside the set remain intimate. In particular, our schemes give the first public key patient-controlled encryption to user for flexible hierarchy, which was yet to be known.