Now existing access control scheme has the strong dependence to trusty third party in cloud．With regard to this problem，this paper proposes all access control scheme based on attribute．It designs an access control model in cloud，constructs all access control policy which adopts the way of Attribute—based Encryption(ABE)tree，and presents a method of user revocation and policy updates．Security analysis indicates that the scheme has the features ofcollusion—resistance，data confidentiality and backward and forward secrecy．

Access Control Scheme in Cloud.pdf

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