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Puncturable ciphertext-policy attribute-based encryption scheme for efficient and flexible user revocation
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DOI：10.1007/s11432-022-3585-9.png)
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With the rapid deployment of storage services, secure and efficient user authorization and revocation data shared through the cloud have become a grand challenge hindering cloud data applications. When previous direct and indirect user revocation schemes implemented large-scale user revocation, they faced heavy communication and computational costs. To address these challenges, this study presents a new encryption scheme that combines ciphertext-policy attribute-based encryption (CP-ABE) with puncturable encryption to achieve efficient and flexible user revocation. We design a proxy server to reduce the computational overhead in the decryption phase. Because the puncture process is performed on a semi-honest cloud, we use the digital signature method to verify the correctness of its operation. Furthermore, we prove the security of our scheme under the chosen-plaintext attack (CPA), and compare it with other schemes to highlight its advantages. Numerical analysis and experimental simulation results reveal that our scheme is more suitable than other schemes for use in a cloud environment for user revocation.
Keyword:
ciphertext-policy attribute-based encryption
puncturable encryption
user revocation
outsource decryption
digital signature
期刊
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7.6
论文数:
4.9K
被引数:
8.9K
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