A Framework of Multi-Authority Attribute-Based Encryption with Outsourcing and Revocation

Abstract

Attribute-based encryption (ABE) is a cryptographic tool for fine-grained data access control. For practical needs, an ABE scheme should support multiple authority and revocation. Furthermore, decryption should also be outsourced for higher efficiency. Researchers have been extending existing ABE schemes for these goals. Yet, the rationales are often hidden behind tailor-made number-theoretic constructions. This paper proposes a framework for constructing multi-authority ABE schemes with attribute revocation and outsourced decryption, from any pairing-based single-authority ABE scheme which satisfies a set of properties we identified.