2010 | OriginalPaper | Buchkapitel
Lattice Basis Delegation in Fixed Dimension and Shorter-Ciphertext Hierarchical IBE
verfasst von : Shweta Agrawal, Dan Boneh, Xavier Boyen
Erschienen in: Advances in Cryptology – CRYPTO 2010
Verlag: Springer Berlin Heidelberg
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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.