Attribute-Based Encryption Resilient to Auxiliary Input
Attribute-Based Encryption Resilient to Auxiliary Input
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DOI：
10.1007/978-3-319-26059-4_21
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发表时间：
2015-11
期刊：
影响因子：
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通讯作者：
Zhiwei Wang;S. Yiu
中科院分区：
文献类型：
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作者：
Zhiwei Wang;S. Yiu
Theauxiliary inputmodel defines a class of computationally uninvertible function familiesto simulate a large class of leakage. Such a functioncan information-theoretically reveal the entire secret keySK, but it is still computationally infeasible to recoverSKfromf(SK). That meansSKcan be used for multiple tasks, sinceSKdoesn’t need to be continually refreshed. We propose the first CP-ABE scheme based on linear secret sharing schemes, that can tolerate leakage on master key and attribute-based secret keys withauxiliary input(AI). For the security proof of our scheme, we present three modified assumptions in composite order bilinear groups, and prove their hardness. Under these modified assumptions, our scheme can be proved AI-CPA secure in the standard model. Finally, we devise a key-policy ABE scheme also resilient toauxiliary input.
