HEU

homomorphic encryption processing unit (HEU)

Background

This project consists of two parts:

HE Library (currently implemented): This project can be used as a high-performance and complete homomorphic encryption library, which integrates almost all homomorphic encryption algorithms in the industry. At the same time, HEU encapsulates each algorithm and provides a uniform interface. You can switch between different HE algorithms at any time without modifying business code.

HE device (in work): As a component of Secretflow, HEU abstracts the homomorphic encryption algorithms into a programmable device, making it easy for users to flexibly build applications using the homomorphic encryption technology without professional knowledge. HEU (device) aims to build a complete computing solution through HE, that is, based on HE, any type of computing can be completed. Compared with PPU, HEU’s computation is purely local without any network communication, so HEU and PPU are complementary

Depending on the computing power, HEU has 4 working modes:

working mode	Supported calculation types	Number of calculations	HE algorithms	Calculating speed	Ciphertext size
PHEU	addition	Unlimited	Paillier, -	Fast	Small
LHEU	addition, multiplication	Limited	BGV, CKKS	Fast (packed mode)	Least (packed mode)
FHEU (low precision)	addition, mux, LUT	Unlimited	TFHE (Torus)	Fastest	Large
FHEU (high precision)	addition, multiplication, comparison, mux	Unlimited	TFHE (Bitwise)	Very slow	Largest

Repo status

PHE has been basically developed, LHE and FHE are under development

Build

# build the C++ phe library
bazel build --verbose_failures //heu/library/phe

# usage example (c++)
bazel test //heu/library/phe:phe_test

# build the python phe library
bazel build -c opt //heu:heu_wheel
pip install bazel-bin/heu/(cat bazel-bin/heu/heu_wheel.name) --force-reinstall

# usage example (python)
cat heu/pybind/phe_test.py
bazel test //heu/pybind:phe_test