August 2019: Improved noise managemebt in HElib. Better and more robust bootstrapping algorithm. Ubuntu 18.04 Docker image with HElib and its dependencies. See install instructions in DOCKER_USAGE.md
July 2019: Added new bootstrapping and PGFFT tests.
June 2019: Added implementation of PGFFT to replace Armadillo for FFTs in
the CKKS scheme. See comments in
PGFFT.h for more information.
May 2019: CKKS bug fixes and fixed compiler warnings.
April 2019: Moved the HElib repository on github from shaih/HElib to
HomEnc/HElib. Introduced HElib-specific exceptions, replaced C
std::exception to use HElib-specific assertions that throw the new
exceptions. See comments in
exceptions.h for usage
March 2019: Introduced new test framework (google test), documented in
TESTS.md. Previous framework will be deprecated. Added a cmake
build script for building HElib and dependencies, documented in
INSTALL.md. Added an example program, see
January 2019: Multiple changes: CKKS support, new modulus-chain implementation, better noise management, etc. Documented in changes.md
March 2018: Re-implementation of homomorphic linear transformations, featuring speedups of 15x to 75x.
Dec 2017-Jan 2018: Added some routines for addition/multiplication and
comparisons of integers in binary representation, and for homomorphic table
lookup. See the supported interfaces in
tableLookup.h. Some examples are in
The inputs and outputs to the new routines are logically vectors of Ctxt objects
(one Ctxt per bit in the binary representation). These vectors are wrapped by
CtPtrs wrapper (see
CtPtrs.h and the underlying
PtrsMatrix.h). Hence the same logic will work for any type of input that can
be mapped logically to arrays of
Ctxts, as long as one can wrap them with the
same wrapper class. In particular, we implemented wrappers for
HElib is a software library that implements homomorphic encryption (HE). Currently available is an implementation of the Brakerski-Gentry-Vaikuntanathan (BGV) scheme, along with many optimizations to make homomorphic evaluation runs faster, focusing mostly on effective use of the Smart-Vercauteren ciphertext packing techniques and the Gentry-Halevi-Smart optimizations. See this report for a description of a few of the algorithms using in this library. Starting December 2014, the library also includes bootstrapping.
At its present state, this library is mostly meant for researchers working on HE and its uses. Also currently it is fairly low-level, and is best thought of as "assembly language for HE". That is, it provides low-level routines (set, add, multiply, shift, etc.), with as much access to optimizations as we can give. Hopefully in time we will be able to provide higher-level routines.
This library is written in C++ and uses the NTL mathematical library (version 10.0.0 or higher). As of March 2015, it also supports multi-threading. HElib is distributed under the terms of the Apache License v2.0. For more information see the GitHub Pages.