Lattice basis delegation in fixed dimension and shorter ciphertext hierarchical IBE

Authors: S. Agrawal, D. Boneh, and X. Boyen

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.

In proceedings of Crypto 2010, LNCS 6223, pp. 98-115, 2010   [BIBTEX]

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