In public cloud storage services, data are outsourced to semi-trusted cloud servers which are outside of data owners’trusted domain. To prevent untrustworthy service providers from accessing data owners’ sensitive data, outsourced data are often encrypted. In this scenario, how to conduct access control over these data becomes a challenging issue. Attribute Based Encryption(ABE) has been proven to be a powerful cryptographic tool to express access policies over attributes, which can provide a fine-grained, flexible, and secure access control over outsourced data. However, existing ABE-based access control schemes do not support users to gain the access permission by collaboration. In this paper, we explore a special attribute-based access control scenario where multiple users having different attribute set scan collaborate to gain access permission if the data owner allows their collaboration in the access policy. Meanwhile, the collaboration that is not designated in the access policy should be regarded as a collusion and the access request will be denied.We propose an attribute-based controlled collaborative access control scheme through designating translation nodes in the access structure. Security analysis shows that our proposed scheme can guarantee data confidentiality and has many other critical security properties. Extensive performance analysis shows that our proposed scheme is efficient in terms of storage and computation overhead.
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