A C++17 implementation of Fuzzy PSI protocol written using the Oblivious Transfer extension LibOTe library.
This is an implementation of our new, fast FuzzyPSI protocol accepted at CRYPTO'22. As a representative example we consider the case where Alice has a structured set A with 10 million total points, and Bob has an unstructured set B of 1.2 million points. We hold the total cardinality of Alice’s set constant and consider two different ways that her points could be arranged into balls: • 6250 balls of radius δ = 20, in 2 dimensions • 2778 balls of radius δ = 30, in 2 dimensions. We assign dimensions d = 2, our choice of bFSS is a (p = 0.75, k = 2)-bFSS instantiated within the structure-aware PSI framework.
Our protocol involves cryptographic components (1) base oblivious transfers (2) hamming correlation hash function (3) encryption/decryption functionalities and a general communication framework. For the hamming-correlation robust hash function we use SHA256. For base OTs and general framework we use the libOTe library. We implement the bFSS recipe spatial hash ◦ concat ◦ tt, for balls of pairwise distance > 4δ, and use the OKVS implementation from libPaXos for spatial hashing.
We implement our protocol within the LibOTe library. Please follow the libOTe library to first build the repository and install the necessary dependencies.
The library can be built as
git clone --recursive https://github.com/osu-crypto/libOTe.git
cd libOTe
python build.py --setup --boost --relic
python build.py -- -D ENABLE_RELIC=ON -D ENABLE_ALL_OT=ON
In order to link libPaXos,
sudo apt install libntl-dev liblinbox-dev libgmp-dev libboost-system-dev libssl-dev libiml-dev
The main executable with examples is frontend and is located in the build directory, eg out/build/linux/frontend/frontend.exe. Run the protocol as -
cd out/build/linux/frontend
./frontend libOTE -f
Dependancies can be managed via the build.py script or or installed via an external tool. Look at LibOTe for details.
Contact Gayathri Garimella garimelg@oregonstate.edu for any assistance on building or running the library.
This project has been placed in the public domain and/or MIT license. As such, you are unrestricted in how you use it, commercial or otherwise. However, no warranty of fitness is provided. If you found this project helpful, feel free to spread the word and cite us.