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A cloud storage system, used to store large number of data in storage server. Cloud system is used to provide large number storage servers, which provide long-term storage service over the Internet. Third party's cloud system does not provide data confidentiality. Constructing centralized storage system for the cloud system makes hackers stole data easily. General encryption schemes protect data confidentiality. In the proposed system a secure distributed storage system is formulated by integrating a threshold proxy re-encryption scheme with a decentralized erasure code. The distributed storage system not only supports secure and robust data storage and retrieval, but also lets a user forward data from one user to another without retrieving the data back.
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