To keep the data in the cloud confidential against unauthorized parties,a cryptographic access control solution called hybrid cloud re-encryption(HCRE)based on attribute-based encryption(ABE)was introduced.HCRE designed a secret sharing scheme to delegate the task of ABE re-encryption to the cloud service provider(CSP),which alleviates the administering burdens on the data owner.Experiments show that HCRE can handle dynamic access policies in a more ef-ficient way.Additionally,HCRE does not reveal extra information of the plaintext to the CSP,thus it does no harm to the data confidentiality.
