Lattice Basis Delegation in Fixed Dimension and Shorter-Ciphertext Hierarchical IBE

We present a technique for delegating a short lattice basis that has the advantage of keeping the lattice dimension unchanged upon delegation. Building on this result, we construct two new hierarchical identity-based encryption (HIBE) schemes, with and without random oracles. The resulting systems are very different from earlier lattice-based HIBEs and in some cases result in shorter ciphertexts and private keys. We prove security from classic lattice hardness assumptions.

• Type: Conference
• Year: 2010
• Where: CRYPTO
• Authors: Shweta Agrawal, Dan Boneh, Xavier Boyen
• Keywords: CRYPTO 2010, Cryptology, Lattice Dimension, Lattice Hardness Assumptions, Short Lattice Basis