anjor / chaum_pedersen

ZKP Auth protocol

A proof of concept application implementing the Chaum–Pedersen Protocol as an authentication service.

See Cryptography: An Introduction (3rd Edition) Nigel Smart for more details about the protocol.

Implementation

The protocol is implemented as simple server and client applications. The server functions as the "Verifier", whereas the client functions as the "Prover". The main implementation code is in the zkp_auth directory. Simple wrappers are also provided in the server and client directories.

The protobuf is included in auth.proto.

Server

In order to start the server simply run

go run ./server/server.go

This stands up a server listening on port 50051 providing three RPC methods defined in the protobuf, namely - Register, CreateAuthenticationChallenge and VerifyAuthentication.

Client

The client provides two simple functions Register and Login making it easy to integrate into any client-side code. There is an example integration in the wrapper code.

Docker

Both the server and the client codes are dockerised using the corresponding docker files: Dockerfile-server and Dockerfile-client.

A docker-compose is also provided for convenience. Running docker-compose up --build stands up the server and the client in separate docker containers, and runs the test client code.

The test client code includes two tests: (1) Registration + successful login attempt (2) Registration + unsuccessful login attempt.