- approximate greatest common divisor (approximate-GCD) - NTRU, which is an open-source implementation. The acronym (pronounced en-true) was originally derived from (deep sigh) the pun _Number Theorists 'R' Us_ [source](https://en.wikipedia.org/wiki/NTRU) - (Ring-) Learning With Errors problems (LWE) ## (Ring-)LWE-based schemes ### BGV-like - smaller [[ciphertext]]s - B(G)V: named after its creators, [[Gentry]], [[Zvika Brakerski]], and [[Vinod Vaikuntanathan]] - B/FV: named after *its* creators, the B of which is [[Zvika Brakerski]] again - HEEAN ### GSW- like - larger [[ciphertext]]s - noise grows slower than in BGV-like schemes - GSW itself - FHEW - [[TFHE]]