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Cloud storage enables users to remotely store their data and enjoy the on-demand high quality cloud applications without the burden of local hardware and software management. Though the benefits are clear, such a service is also relinquishing users' physical possession of their outsourced data, which inevitably poses new security risks towards the correctness of the data in cloud. In order to address this new problem and further to achieve a secure and dependable cloud storage service, the authors develop a new cryptosystem for fine-grained sharing of encrypted data that they call Cipher-Policy Attribute-Based Encryption (CP-ABE) with verifiable outsourced decryption.
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