Data sharing in cloud storage is playing major role in Information Communication, since it can provide users with efficient and effective storage services. In order to provide security to the shared secret data, the cryptographic techniques are usually applied. However, the data cryptographic key is protected by the two factors. Only if both the factors works, the secrecy of the cryptographic key is held. 2) The cryptographic key can be revoked efficiently by integrating the proxy reencryption and key separation techniques. 3) The data is protected in a fine-grained way by adopting the attribute based encryption technique. Furthermore, the security analysis and performance evaluation show that our proposal is secure and efficient, respectively.
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