Blind key-generation attribute-based encryption for general predicates

Abstract Attribute-based encryption (ABE) is a form of public-key that allows fine-grained access control on encrypted data. Blind key-generation (BKG) attribute-based (Rial, Designs, Codes and Cryptography 2016 ) variant in which the master authority issues secret keys without learning any information about attributes associated to them. This extra functionality makes it an appealing building block for several applications. In this work, we extend generic framework ABE based pair encodings (Attrapadung, Eurocrypt 2014 support blind key-generation. particular, define two new notions coin BKG-compatible algebraic encoding. We show every encoding satisfies former loss generality, whereas latter satisfied by all existing from literature. then how enhance achieve honest-but-curious case encodings, our protocol admits very efficient version, secure against malicious parties. The main advantage work generality. Our designed over recent most advanced modular frameworks can handle rich variety predicates.