Dynamic Attribute-Based Access Control in Cloud Storage Systems

Cloud storage service allows data owner to store their big data in the cloud and provides data access to the users. As the cloud server is not trustworthy, we cannot rely on the server to conduct data access control. To protect data security and privacy, Attribute-Based Encryption (ABE) is a promising technique for data access control in cloud storage, because it provides data owner more direct control on access policies. However, there are two dynamic issues, namely attribute revocation and policy updating, that should be solved first before deploying ABE in practice. In this paper, we design a dynamic attribute-based access control scheme, which can solve the above two problems simultaneously. Besides, our scheme can support large universe of attributes, which makes it more available in cloud storage system. The proposed scheme is proved statically secure in random oracle model.