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Title:
A Successful Subfield Lattice Attack on a Fully Homomorphic Encryption Scheme
Authors: Martha Norberg Hovd
Abstract:We present the application of a known subfield lattice attack on a fully homomorphic encryption scheme based on NTRU. We show that the scheme is vulnerable to the attack due to a particular parameter having to satisfy a derived lower bound. We also show that, due to the structure of the scheme, the attack is successful in all practical instantiations of the scheme.
ePrint: https://eprint.iacr.org/2021/1626
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