Arithmetical Improvement of the Round-Off for Cryptosystems in High-Dimensional Lattices.

With Lattice-based cryptography (LBC), ciphertexts are represented as points near a lattice, and Babai's round-off algorithm allows to decrypt them when one knows the secret-key. Recently, an accelerated variant of the round-off, based on Residue Number Systems (RNSs), has been proposed. Herein, we combine this technique with the use of lattices of Optimal Hermite Normal Form (OHNF) and propose fu...