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Provably secure attribute-based encryption with attribute revocation and grant function using proxy re-encryption and attribute key for updating
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DOI：10.1186/s13673-015-0027-0.png)
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Abstract
En 中文
Ciphertext-Policy Attribute-Based Encryption (CP-ABE) is suitable for data access control on a cloud storage system. In CP-ABE, the data owner encrypts data under the access structure over attributes and a set of attributes assigned to users is embedded in user's secret key. A user is able to decrypt if his attributes satisfy the ciphertext's access structure. In CP-ABE, processes of user's attribute revocation and grant are concentrated on the authority and the data owner. In this paper, we propose a ciphertext-policy attribute-based encryption scheme delegating attribute revocation processes to Cloud Server by proxy re-encryption. The proposed scheme does not require generations of new secret key when granting attributes to a user and supports any Linear Secret Sharing Schemes (LSSS) access structure. We prove that the proposed scheme is secure against attack by unauthorized users and Cloud Server.
Keywords:
Cryptographic cloud storage
Ciphertext-policy attribute-based encryption
Attribute revocation and grant
Proxy re-encryption
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