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Review of Scalable Data Sharing in Cloud Storage Using CP-ABE

Prajakta D.Patil, Chhaya Nayak

Data sharing is an important functionality in cloud storage. We show how to securely, efficiently, and flexibly share data with CP-ABE method in secure cloud storage. We describe new public-key cryptosystems which produce constant-size ciphertexts such that efficient delegation of decryption rights for any set of ciphertexts 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 constantsize aggregate key for flexible choices of ciphertext 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. To provide a secure data sharing we propose an attribute based encryption technique, there are two types namely KP-ABE (key policy attribute based encryption) and CP-ABE(Cipher text policy Attribute based Encryption). In this paper we propose CP-ABE scheme.