Playground for MPC-based Data Exchanges

As part of the KRAKEN datamarket, users should be able to exchange data with each other. Since the datamarket offers analytics on data via MPC, one of the goals was to design the data exchange also with the already present MPC setup in mind. Therefore, we designed a data exchange platform that offers several features:

• Data exchange is possible even if the data owner is offline. Therefore, the data owner is able to define access policies that are checked by the datamarket and the MPC nodes. If the receiver satisfies the outlined requirements, they are granted access.
• The exchanged data should be end-to-end secure as long as an MPC-style assumption holds, i.e., not all MPC nodes have been compromised.

We follow the KEM/DEM priinciple, hence it suffices to solve the exchange of the symmetric encryption/AEAD keys. This repoistory is therfore dedicated to prototyping some protocols that achieve the above features.

Dependencies

This playground requires the following dependencies to successfully run:

• Python >= 3.7
• python-relic >= 0.2.1

Quick installation guide

If you are running Ubuntu 20.04, the easiest way to install python-relic is via my PPA:

sudo add-apt-repository -u ppa:s-ramacher/ait
sudo apt install python3-pyrelic

It comes with a pre-built version of relic configured for the pairing-friendly BLS12-381 curve.

Otherwise, python-relic can be installed via pip:

pip install python-relic

License

The code is licensed under the MIT license and was written by Sebastian Ramacher (AIT Austrian Institute of Technology).

Acknowledgements

This work has been funded by the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 871473 (KRAKEN).