A Boolean circuit-based revocable ciphertext policy attribute-based encryption scheme.

Attribute-based encryption is a new cryptographic primitive that supports fine-grained access control of cloud data, and its access control function relies on the interaction of attributes and access structures. To achieve more flexible access control, attribute revocation has become an important problem that must be considered in the application process of attribute-based encryption. We propose and implement an efficient revocable ciphertext policy attribute-based encryption scheme based on the improvement of the scheme proposed by Tomida et al. Our scheme has the following characteristics: (1) It is adaptively secure under the Matrix Decisional Diffie–Hellman assumption; (2) it supports the multi-use of attribute classes and the negation of attribute values; (3) it supports the revocation of system attributes; and (4) the update of the key and ciphertext is completed by the trusted center and the cloud server, respectively, thereby decreasing revocation overhead for users. [ABSTRACT FROM AUTHOR]