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Abstract
Data sharing becomes an exceptionally attractive service supplied by cloud computing platforms because of its convenience and economy. As a good technique for realizing fine grained data sharing, attribute -based encryption (ABE) has drawn wide attentions but most of the existing ABE solutions suffer from the disadvantages of high computation overhead and weak data security, which has severely impeded resource - constrained mobile devices to customize the service. In this project, we present the comparison of Elgamal and pallier in term of encryption time, decryption time, throughput, encrypted file size and decrypted file size . In this paper, we use SHA-1 algorithm to evaluate performance by considering both encryption and decryption time
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