Fully homomorphic encryption

A cryptosystem that supports arbitrary computation on ciphertexts is known as fully homomorphic encryption (FHE) and is far more powerful.

Current state of art

20ms per logical gate per bit.
Implementation (library): https://tfhe.github.io/tfhe/tuto-cloud.html
Easy introduction: https://crypto.stanford.edu/craig/easy-fhe.pdf Paper: https://eprint.iacr.org/2013/340
Discussion: https://news.ycombinator.com/item?id=14947768