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The way some of the Lattice-based Crypto works is by creating a private basis, with short orthogonal vectors that allows for easy computation. The public basis consists of an HNF, coined "Bad-basis", with non-orthogonal vectors that makes breaking the system difficult: NTRU-encrypt(one version of it) works as follows: Private-key: Given parameter $q$ two ...


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Almost all lattice-based schemes that have somewhat practical performance use lattices from a subset of all lattices. Those lattices have additional structure and can be described using polynomials. The big advantage of doing this is that on the one hand the size of a description of the lattice is much smaller than for arbitrary lattices and on the other ...



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