Asian Journal of Engineering and Technology Innovation

Secure Sharing of Data in Cloud through Key Aggregation

LakshmiKantha K.N and Mr. A. Ananda Shankar

Reva Institute of Technology and Management, Bengaluru

Abstract

Cloud storage is a model of data storage in which the digital data is stored in logical pools, and the physical storage spans multiple servers. Security thus plays a crucial role in clouds and multiple schemes have been developed for the same. While implementing security, considerable thought must be given to the amount of overhead faced. The proposed model incorporates an aggregate key that ensures security, flexibility and efficiency. It is a new public key cryptosystem producing constant-size encrypt 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 one key, but encompassing power of all keys being aggregated. Secret key holder can release a constant-size aggregate key for flexible choices of cipher-text set in cloud storage, but other encrypted files outside the set remain confidential. This key can then be given to others conveniently.

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