A lattice is defined in mathematics in a similar way as in everyday life: In the simplest case, it is understood to be a construct of parallel straight lines (“lattice bars”) equally spaced and running in two different directions. However, as is common in mathematics, a lattice can also be viewed in higher dimensions. Under a ten- or hundred-dimensional grid one cannot imagine anything more, but one can calculate with it. In a many-dimensional lattice it is difficult to find the nearest intersection point of the lattice bars to any pubkt. This can be exploited for asymmetric encryption. Lattice-based crypto methods are currently on the rise because they are considered secure against quantum computers.