Inspec keywords: authorisation; trees (mathematics); cryptography; learning (artificial intelligence); lattice theory

Other keywords: attribute granting; binary tree technique; fine-grained access control; learning-with-errors assumption; identity-based encryption; attribute revocation; revocable-and-grantable attribute-based encryption; RABE scheme; data security

Subjects: Knowledge engineering techniques; Combinatorial mathematics; Combinatorial mathematics; Data security; Cryptography