nilDB FHE Key Storage

MPC key storage experiments for various FHE cryptosystems using Nillion's nilDB

1) Set up nilDB

First, register a new organization to get access to nilDB here. Then, copy and edit the .env file:

cp .env.sample .env

Next, create a nilDB schema:

cd ./src/nildb
python main.py --create-schema

2) Set up the FHE library:

2.1) Lattigo

Let's generate the FHE keys to store (this will first generate the keys and then run the FHE computation):

cd ./src/lattigo
go run bgv-main.go

2.2) TFHE-rs

Let's generate the FHE keys to store (this will first generate the keys and then run the FHE computation):

cd ./src/tfhe-rs
cargo run -r

2.2) SEAL

Let's generate the FHE keys to store (this will first generate the keys and then run the FHE computation):

sudo apt-get update -y
sudo apt-get install build-essential cmake
# Clone SEAL
git clone https://github.com/microsoft/SEAL
cd SEAL
# Create build
cmake -S . -B build
# Compile build
cmake --build build
# Install SEAL
sudo cmake --install build

Now let's compile the script that enables us to do everything together.

g++ -I/usr/local/include/SEAL-4.1 seal_key_generator.cpp /usr/local/lib/libseal-4.1.a -o seal_key_generator.out

Finally, execute it with:

./seal_key_generator.out
# Or specify the directory where you want the keys stored as:
./seal_key_generator.out -d my_seal_keys

3) Store and retrieve keys to and from nilDB

cd ./src/nildb
# For Lattigo keys
python main.py --store-keys ../lattigo/keys
# For TFHE-rs keys
python main.py --store-keys ../tfhe-rs/keys
# For SEAL keys
python main.py --store-keys ../seal/keys

The returned ID will look something like 8100e495-5168-40a5-be0e-91654ef6ee11, keep it safe to use it later when retrieving data.

To retrieve:

# For Lattigo keys
python main.py --retrieve-keys ../lattigo/keys --record-ids 8100e495-5168-40a5-be0e-91654ef6ee11
# For TFHE-rs keys
python main.py --retrieve-keys ../tfhe-rs/keys --record-ids 8100e495-5168-40a5-be0e-91654ef6ee11
# For SEAL keys
python main.py --retrieve-keys ../seal/keys --record-ids 8100e495-5168-40a5-be0e-91654ef6ee11

Finally, go back to Lattigo / TFHE-RS / SEAL and run it again, it'll find the FHE keys and not generate new ones.