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Provably secure attribute-based encryption with attribute revocation and grant function using proxy re-encryption and attribute key for updating

机译:使用代理重新加密和用于更新的属性密钥,具有属性吊销和授予功能的可验证的基于属性的加密

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摘要

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.
机译:基于密文策略的基于属性的加密(CP-ABE)适用于云存储系统上的数据访问控制。在CP-ABE中,数据所有者在访问结构下通过属性对数据进行加密,并将分配给用户的一组属性嵌入用户的密钥中。如果用户的属性满足密文的访问结构,则可以解密。在CP-ABE中,用户的属性吊销和授予过程集中在权限和数据所有者上。在本文中,我们提出了一种基于密文策略的基于属性的加密方案,通过代理重新加密将属性吊销过程委托给Cloud Server。提议的方案在向用户授予属性时不需要生成新的秘密密钥,并且支持任何线性秘密共享方案(LSSS)访问结构。我们证明了该方案是安全的,可以防止未经授权的用户和Cloud Server的攻击。

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