Computing capacity and storage space need of these devices are ever-increasing tremendously, it demands the secure way of storing the data in cost efficient model. There are vast numbers of users who use cloud services through mobile devices such as mobiles, PDA, tablets, laptops outstanding to its portability feature. Cloud Computing has many advantages inherent in it, but yet there are several risks and constraint exists, for e.g. protection, data access control, efficiency, bandwidth, etc a novel remote data integrity checking model: IDP (identity-based proxy) in multi-cloud storage. The formal system model and security model are given. Based on the bilinear pairings, a concrete IDP protocol is designed.To analyze the efficiency of various well known cryptographic algorithms such as Identity-based cryptography,Proxy public key cryptography, these symmetric algorithms were implemented on cloud background and through the results derived from real time implementation of these algorithms on various handheld procedure, it is shown that which cryptographic technique can provide efficient and reliable security mechanism for information access control and security of user’s outsourced information in cloud computing.

Data security, Cryptographic techniques; Identity-based cryptography, Proxy public key cryptography

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