Secure and Efficient Enhanced Sharing of Data Over Cloud Using Attribute Based Encryption with Hash Functions

Cloud computing is a model on which association and people can work with application from anywhere on demand. The real issue of cloud computing is preserving integrity and confidentiality of data in data security. The essential solution for this issue is data encryption on cloud. Security in cloud computing being one of the great research subjects. Numerous strategies have been proposed on attribute-based encryption systems. Attribute Based Encryption (ABE) is a cryptographic crude that understands the thought of cryptographic access control. This research work proposed attribute-based encryption method based on hash function associated with asymmetric encryption. The performance of the proposed algorithm has been evaluated by simulation using Cloudsim toolkit. For simulation we have analyzed the results on the basis of different File Size and simulated the results of proposed algorithm. Encryption Time, Key Generation Time and decryption time are evaluated and compared with the existing algorithm. Performance of proposed hash-based ABE algorithm is compared with the existing ABE algorithm. Experimental results demonstrate that proposed technique takes less time for encryption, decryption and for computing key than the existing technique and hence, performs better than existing algorithm. The average improvement is 13.54% in the proposed ABE with hashing as compared to existing ABE on the basis of encryption time; average approximate increase in the efficiency of key computation time is 3.72% as compared with the existing; 11.08% of improvement in decryption time.