Abstract
AbstractCiphertext-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.
Highlights
Sharing of data on a cloud storage has a risk of information leakage caused by service provider’s abuse
We propose a Ciphertext-Policy Attribute-Based Encryption (CP-ABE) scheme delegating attribute revocation processes to Cloud Server by proxy re-encryption and meets the following requirements
Security Definition We prove that unauthorized users and Cloud Server cannot decrypt ciphertext CT that was encrypted by the proposed scheme
Summary
Sharing of data on a cloud storage has a risk of information leakage caused by service provider’s abuse. In order to protect data, the data owner encrypts data shared on the cloud storage so that only authorized users can decrypt. Ciphertext-Policy Attribute-Based Encryption (CP-ABE) [1,2] is suitable for data access control in the cloud storage system. The authority manages the attributes in the system. The data owner chooses an access structure and encrypts message under the access structure. The set of attributes assigned to users is embedded in his secret key. A user is able to decrypt a ciphertext if his attributes satisfy the ciphertext’s access structure
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