Improved (Hierarchical) Inner-Product Encryption from Lattices

Lattice-Based Hierarchical Inner Product Encryption

Hierarchical identity-based inner product functional encryption

Efficient Lattice-Based Inner-Product Functional Encryption

Improved unbounded inner-product functional encryption

Hierarchical Identity-Based Inner Product Functional Encryption for Unbounded Hierarchical Depth

Attribute-Based Inner-Product Functional Encryption from Standard Lattices