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https://github.com/HomEnc/HElib

HElib is an open-source software library that implements homomorphic encryption. It supports the BGV scheme with bootstrapping and the Approximate Number CKKS scheme. HElib also includes optimizations for efficient homomorphic evaluation, focusing on effective use of ciphertext packing techniques and on the Gentry-Halevi-Smart optimizations.
https://github.com/HomEnc/HElib

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HElib is an open-source software library that implements homomorphic encryption. It supports the BGV scheme with bootstrapping and the Approximate Number CKKS scheme. HElib also includes optimizations for efficient homomorphic evaluation, focusing on effective use of ciphertext packing techniques and on the Gentry-Halevi-Smart optimizations.

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HElib

=====



[![Build and Test](https://github.com/homenc/HElib/actions/workflows/github-ci.yml/badge.svg)](https://github.com/homenc/HElib/actions/workflows/github-ci.yml)



HElib is an open-source ([Apache License v2.0][5]) software library that

implements [homomorphic encryption][6] (HE). Currently available schemes are the

implementations of the [Brakerski-Gentry-Vaikuntanathan][1] (BGV) scheme with

[bootstrapping][8] and the Approximate Number scheme of [Cheon-Kim-Kim-Song][9]

(CKKS), along with many optimizations to make homomorphic evaluation run faster,

focusing mostly on effective use of the [Smart-Vercauteren][2] ciphertext

packing techniques and the [Gentry-Halevi-Smart][3] optimizations. See [this

report][7] for a description of a few of the algorithms using in this library.



Please refer to [CKKS-security.md](CKKS-security.md) for the latest discussion

on the security of the CKKS scheme implementation in HElib.



Since mid-2018 HElib has been under extensive refactoring for *Reliability*,

*Robustness & Serviceability*, *Performance*, and most importantly *Usability*

for researchers and developers working on HE and its uses.



HElib supports an *"assembly language for HE"*, providing low-level routines

(set, add, multiply, shift, etc.), sophisticated automatic noise management,

improved BGV bootstrapping, multi-threading, and also support for Ptxt

(plaintext) objects which mimics the functionality of Ctxt (ciphertext) objects.

The report [Design and implementation of HElib][11] contains additional details.

Also, see [CHANGES.md](CHANGES.md) for more information on the HElib releases.



Full installation instructions and a list of the required dependencies can be

found in [INSTALL.md](INSTALL.md).



For guidance in getting started programming with HElib, take a look at the

example programs and our CKKS tutorials located in the `examples` directory. See

[examples/README.md](examples/README.md).



If you are interested in contributing to HElib, please read our

[Contributing Guidelines](CONTRIBUTING.md).



HElib is written in C++17 and uses the [NTL mathematical library][4].  

HElib is distributed under the terms of the [Apache License v2.0][5].  



  [1]: http://eprint.iacr.org/2011/277       "BGV12"

  [2]: http://eprint.iacr.org/2011/133       "SV11"

  [3]: http://eprint.iacr.org/2012/099       "GHS12"

  [4]: http://www.shoup.net/ntl/             "NTL"

  [5]: http://www.apache.org/licenses/LICENSE-2.0  "Apache-v2.0"

  [6]: http://en.wikipedia.org/wiki/Homomorphic_encryption "Homomorphic encryption"

  [7]: http://eprint.iacr.org/2014/106       "algorithms"

  [8]: http://eprint.iacr.org/2014/873       "bootstrapping"

  [9]: http://eprint.iacr.org/2016/421       "CKKS16"

  [10]: https://github.com/homenc/HElib      "GitHubPages"

  [11]: https://eprint.iacr.org/2020/1481    "HElib Design"