I think it means that this implementation of homomorphic encryption relies on polynomial computations being done on the plane of a geometrical torus? See the re

I think it means that this implementation of homomorphic encryption relies on polynomial computations being done on the plane of a geometrical torus? See the relevant paper here: https://eprint.iacr.org/2016/870.pdf https://eprint.iacr.org/2016/870.pdf Someone with more background could probably expand on that.