A Collaborative Key Management Protocol in Cipher text Policy Attribute-Based Encryption for Cloud Data Sharing - 2017


Ciphertext policy attribute-based encryption (CP-ABE) could be a promising cryptographic technique for fine-grained access management of outsourced knowledge within the cloud. But, some drawbacks of key management hinder the recognition of its application. One drawback in urgent would like of resolution is the key escrow drawback. We have a tendency to indicate that front-end devices of purchasers like good phones generally have limited privacy protection, therefore if personal keys are entirely held by them, purchasers risk key exposure that's hardly noticed but inherently existed in previous research. Furthermore, monumental client decryption overhead limits the sensible use of ABE. In this paper, we tend to propose a collaborative key management protocol in CP-ABE. Our construction realizes distributed generation, issue and storage of non-public keys while not adding any additional infrastructure. A fine-grained and immediate attribute revocation is provided for key update. The proposed collaborative mechanism effectively solves not solely key escrow drawback but also key exposure. Meanwhile, it helps markedly reduce client decryption overhead. A comparison with different representative CP-ABE schemes demonstrates that our theme has somewhat higher performance in terms of cloud-based outsourced knowledge sharing on mobile devices. Finally, we have a tendency to offer proof of security for the proposed protocol.

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