Delegating Capabilities in Predicate Encryption Systems
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Hierarchical Predicate Encryption for Inner-Products
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Predicate encryption is a novel cryptographic primitive that provides fine-grained control over the accesses to encrypted data. It is often used in secure cloud storage and biometric matching. In this manuscript, we first propose a variant of symmetric predicate encryption, which provides controllable privacy preserving search functionalities, including revocable delegated search and un-decryptable delegated search. Due to these functionalities, the owner of a cloud storage can easily control the lifetimes and search privileges of cloud data.