Ciphertext-Policy Attribute-Based Proxy Re-Encryption with Non-Interactivity from Lattices

Abstract

Attribute-based encryption (ABE) is suitable for one-to-many encryption scenarios. In ABE, the encryptor can perform encryption by specifying the attributes of the recipients. However, along with the gradual increase in data encryption applications, it is required to transform access permissions of ciphertexts in some scenarios. Therefore, how to efficiently convert ciphertext has become an important issue. Furthermore, with the development of quantum computers, new encryption schemes need to be resistant to quantum computer attacks. In quantum-resistant ABE schemes, it is not easy to change the access structure of a ciphertext. To solve those issues, we propose a ciphertext-policy attribute-based proxy re-encryption scheme with non-interactivity from lattices. The proposed scheme combines proxy re-encryption with ABE to enhance the convenience of sharing encrypted data in the cloud. In addition to being able to resist quantum attacks, the proposed scheme also provides collusion-resistance, multi-hop re-encryption, and non-interactivity to increase the practicality. Finally, we give formal security proofs for the proposed scheme under the D-LWE problem.