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Access Mechanism for Outsourced Data by Preserving Data Owner's Preference

机译：保留数据所有者的偏好的外包数据访问机制

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摘要

Nowadays cloud services have become a cost-effective platform for sharing data and performing large scale computations. As outsourcing data to a third party involves security and privacy concerns, data should be sent to the cloud in encrypted form. To handle access control on encrypted cloud data, Ciphertext-Policy Attribute-based Encryption (CP-ABE) has become very popular. In this scheme data can be encrypted once and can be read multiple times by the authorized users. However, CP-ABE currently has no mechanism to protect against a user of data being able to alter the access policy originally specified by the owner of the data when s/he re-encrypts the modified data (write operation). In this work, we propose a scheme that extends CP-ABE without compromising the security to preserve data owner defined access policy when multiple write operations are performed along with a user revocation mechanism in a setting where multiple authorities generate decryption keys.
机译：如今，云服务已成为一种经济高效的平台，用于共享数据和执行大规模计算。由于将数据外包给第三方涉及安全和隐私问题，因此应以加密形式将数据发送到云。为了处理对加密的云数据的访问控制，基于密文策略的基于属性的加密（CP-ABE）已变得非常流行。在该方案中，数据可以被加密一次，并且可以由授权用户多次读取。但是，CP-ABE当前没有机制来防止数据用户在重新加密修改后的数据（写操作）时能够更改数据所有者最初指定的访问策略。在这项工作中，我们提出了一种方案，该方案在多个授权机构生成解密密钥的环境中执行多个写操作以及用户撤销机制时，可以在不损害安全性的前提下扩展CP-ABE，以保留数据所有者定义的访问策略。

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