#cryptography #crypto #homomorphic #encryption


An implementation of a lattice-based additive homomorphic encryption scheme

3 unstable releases

0.2.1 Aug 31, 2021
0.2.0 Jun 1, 2021
0.1.1 Mar 23, 2021
0.1.0 Mar 23, 2021

#635 in Cryptography

Download history 25/week @ 2022-05-31 8/week @ 2022-06-07 4/week @ 2022-06-14 8/week @ 2022-06-21 4/week @ 2022-06-28 10/week @ 2022-07-05 8/week @ 2022-07-12 6/week @ 2022-07-19 10/week @ 2022-07-26 9/week @ 2022-08-02 8/week @ 2022-08-09 8/week @ 2022-08-16 13/week @ 2022-08-23 6/week @ 2022-08-30 15/week @ 2022-09-06 11/week @ 2022-09-13

60 downloads per month

MIT license



Cupcake is an efficient Rust library for the (additive version of) Fan-Vercauteren homomorphic encryption scheme, offering capabilities to encrypt vectors, add/subtract two encrypted vectors, and rerandomize a ciphertext.


Cupcake requires or works with

  • Mac OS X or Linux


Add the following line to the dependencies of your Cargo.toml:

Cupcake = "0.2.1"

Building from source

git clone https://github.com/facebookresearch/Cupcake
cd cupcake
cargo build --release


Several examples are included in examples/<name>.rs, and can be run via cargo run --example <name>


Documentation on the API can be built from cargo doc.

Benchmarks and Tests

We have included benchmarks and tests for both homomorphic operations and underlying arithmetic operations. They can be run using cargo bench and cargo test.

Supported parameters

Currently, we provide only one set of secure parameter, namely FV::<Scalar>::default_2048();. This parameter set has an estimated security level of about 128 bits according to the homomorphic encryption security standards link. Use other parameters at your own risk! With the default parameter set, the plaintext type is vector of u8 with a fixed length 2048.


See the CONTRIBUTING file for how to help out.


Cupcake is MIT licensed, as found in the LICENSE file.