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Title:
Stronger and Simpler Updatable Encryption
Authors: Huanhuan Chen, Yao Jiang Galteland, Kaitai Liang
Abstract:We define a stronger confidentiality notion for the ciphertext-dependent updatable encryption. The new notion captures the adaptive security that was not covered in prior works (CRYPTO2017, ASIACRYPT 2020), but also supports both deterministic and randomized constructions. We revise the public key encryption introduced by Micciancio et al. (EUROCRYPT 2012) to a simpler scheme using the lattice trapdoor techniques. Based on the resulting scheme, we further propose a new updatable encryption construction that achieves the new notion under the Learning with Errors assumption.
ePrint: https://eprint.iacr.org/2022/1339
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