Multi-authority cloud storage systems, DAC-MACS. It also construct a new Multi-authority CP-ABE scheme, in which the main computation of decryption is out-sourced to the server.
It is further designed an efficient attribute revocation method that can achieve both forward security and backward security. Our attribute revocation methods incurs less communication cost and less computation cost of the revocation, where only those components associated with the revoked attribute in the secret keys and the ciphertext need to be updated.
Finally this project is provably secure and incurs less storage overhead, communication cost and computation cost, compared to the existing schemes.
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