Abstract
Mobile cloud computing (MCC) is embracing rapid development these days and able to provide data outsourcing and sharing services for cloud users with pervasively smart mobile devices. Although these services bring various conveniences, many security concerns such as illegally access and user privacy leakage are inflicted. Aiming to protect the security of cloud data sharing against unauthorized accesses, many studies have been conducted for fine-grained access control using ciphertext-policy attribute-based encryption (CP-ABE). However, a practical and secure data sharing scheme that simultaneously supports fine-grained access control, large university, key escrow free, and privacy protection in MCC with expressive access policy, high efficiency, verifiability, and exculpability on resource-limited mobile devices has not been fully explored yet. Therefore, we investigate the challenge and propose an Efficient and Multiauthority Large Universe Policy-Hiding Data Sharing (EMA-LUPHDS) scheme. In this scheme, we employ fully hidden policy to preserve the user privacy in access policy. To adapt to large scale and distributed MCC environment, we optimize multiauthority CP-ABE to be compatible with large attribute universe. Meanwhile, for the efficiency purpose, online/offline and verifiable outsourced decryption techniques with exculpability are leveraged in our scheme. In the end, we demonstrate the flexibility and high efficiency of our proposal for data sharing in MCC by extensive performance evaluation.
Highlights
As an emerging paradigm, mobile cloud computing (MCC) is growing exponentially and facilitates the deployment of enormous mobile devices covering public and private sectors [1]
We propose an Efficient and Multiauthority Large Universe Policy-Hiding Data Sharing (EMALUPHDS) scheme to achieve key escrow resistance, expressive access policies without user privacy leakage, and high efficiency for data sharing of Mobile cloud computing (MCC) with resource-limited mobile devices
We introduce outsourced decryption to reduce the computational cost and the online/offline technique to trade off the overhead in encryption operation
Summary
Mobile cloud computing (MCC) is growing exponentially and facilitates the deployment of enormous mobile devices covering public and private sectors [1]. The scheme in [1] provides features of multiauthority, large attribute universe, and high efficiency to resist key escrow problem, but it cannot satisfy policy preserving and verifiability with exculpability. It is urgent to devise a significant data sharing scheme that is addressing all these drawbacks in traditional CP-ABE schemes at the same time when used in MCC, including key escrow resistance, large attribute universe, privacy preserving, expressive policy, and efficiency. Confronting the above problems, we propose an Efficient and Multiauthority Large Universe Policy-Hiding Data Sharing (EMA-LUPHDS) scheme to achieve key escrow resistance, expressive access policies, and high efficiency for data sharing of MCC with resourcelimited mobile devices by extending the decentralized CPABE scheme [15].
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