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A Study on Sharing of Data in Cloud Storage Using Key Aggregate Cryptosystem

Rajesh Krishnan, G Venifa Mini


Cloud Computing is a large scale distributed computing technology where resource are virtualized and provide service over the internet. One of the important functionality of the cloud is data sharing and shows how securely; efficiently and flexibly share data with others in the cloud storage. We describe a new public key cryptosystem that provide a constant size ciphertexts. The novelty is that all the keys in the ciphertext can aggregate into a single key, but the aggregate key encompassing the power of all the keys in the ciphertext and deliver authentication of the user. Encryption of the plaintext is performed by using a new encryption technique named as Onion Encryption. Aggregate keys are sent through a secure network, but the encrypted files outside set remains close. Data dynamics can be implemented to validate the user and the validated users can update, delete and modify the data stored in the cloud. It can be used to flexibly share data with others in the cloud storage.

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