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"

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.

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

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.

• The Fan-Vercauteren scheme

See the CONTRIBUTING file for how to help out.

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