In this paper, we propose a lightweight data sharing scheme (LDSS) for different cloud platforms. It adopts CP-ABE, an access control technology used in most of the cloud environments; there are certain necessary changes in the structure of access control tree to make it suitable for portable cloud environments. LDSS moves a large portion of the computational intensive access control tree transformation in CP-ABE from different devices to external proxy servers. Furthermore, to reduce the user revocation cost, it introduces attribute description fields to implement lazy-revocation, which is a thorny issue in program based CP-ABE systems. The experimental results show that LDSS can effectively reduce the overhead on large number of devices when users are sharing data through different cloud environments
Lightweight, cloud, portable, tree, overhead
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