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Identity-Based Encryption (IBE) which simplifies the public key and certificate management at Public Key Infrastructure (PKI) is an important alternative to public key encryption. However, one of the main efficiency drawbacks of IBE is the overhead computation at Private Key Generator (PKG) during user revocation. Efficient revocation has been well studied(More)
As cloud computing becomes prevalent, more and more sensitive data is being centralized into the cloud for sharing, which brings forth new challenges for outsourced data security and privacy. Attributebased encryption (ABE) is a promising cryptographic primitive, which has been widely applied to design fine-grained access control system recently. However,(More)
With the development of real time localization and mobile computing technology, it becomes increasingly popular for sharing individual locations in mobile online social network (mOSN), which inevitably raises significant concerns on the privacy of users’ locations. Recently, Wei et al. provided the MobiShare mechanism to enable flexible location sharing(More)
With the rapid development of cloud computing, more and more data are being centralized into remote cloud server for sharing, which raises a challenge on how to keep them both private and accessible. Although searchable encryption provides an efficient solution to support keyword-based search directly on encrypted data, considering its application in file(More)
The order of the plaintext remains in the ciphertext, so order-preserving encryption (OPE) scheme is under threat if the adversary is allowed to query for many times. To hide the order in the ciphertext, the only ideal-security OPE scheme (Popa et al., 2013) requires the database server to maintain extra information and realize comparison or range query by(More)
Mobile online social networks (mOSNs) become more and more popular, and compared with traditional OSNs, mOSNs take a step further in that they provide the location-based services, which also raise significant privacy concerns. Location sharing is a fundamental component of mOSN, however, users may be hesitant to share locations if privacy is not guaranteed.(More)