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PPAT prototype

Multi-Party Function Evaluation with Perfectly Private Audit Trail

The modules presented here contain

  • the core arithmetic needed to perform natural operations and pairings on BN- elliptic curves, extension fields, etc.
  • instanciations of the CCE primitive
  • the NIZKPoK needed to compute the PPAT for the test applications
  • the test applications presented in the paper

Running the prototype

  • the file script.py instantiate the CCE primitive: the PPATS and the PPATC public parameters, public keys and secret keys
  • the test modules for the PPAT are respectively test_ppats.py and test_ppatc.py of the ppat package
  • to test the applications, load the testApplications.py module of the applications package and then try the functions:
    • testShortestPath(nbClients) => we recommend < 10 clients
    • testAuctions(nbClients) => we recommend < 1000 clients
    • testLinearSystem(nbClients) => we recommend < 4096 clients and square number

where nbClients is an integer parameter...

Implementing new multi-party protocols

Any new multi-party protocol can be implemented -- for example, but not only -- by inheriting the abstract classes of the ppatProtocol.py of the protocols package. Inherit the classes:

  • Circuit to design the circuit evaluation (a circuit is composed of the Gate objects)
  • Worker
  • Client

to compose your multi-party application. See for example the prototype applications presented above.