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

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.