Cashlib

ZKPDL and Cashlib

ZKPDL (Zero-Knowledge Proof Description Language) is a high-level language designed for specifying cryptographic operations and in particular zero-knowledge proofs. Its corresponding interpreter will, given a program and a set of inputs, output a proof when acting as the prover and verify a proof when acting as the verifier.

The Cashlib library provides functionality for endorsed e-cash and fair exchange protocols. Classes are provided for withdrawing, spending, and depositing e-coins, as well as for bartering for files using an e-coin only as a placeholder. Resolution protocols are provided as well.

For a detailed description of this software please see our paper in USENIX Security 2010: http://www.cs.brown.edu/research/brownie/usenix10.pdf

Pseudocode descriptions of the cryptographic protocols used are available in the "doc/pseudocodes" directory. http://github.com/brownie/cashlib/raw/master/doc/pseudocodes.pdf

A short manual describing our language syntax can also be found in the "doc/manual" directory. http://github.com/brownie/cashlib/raw/master/doc/language.pdf

These documents are still under development and should improve in the future.

Many example programs are available in the "src/ZKP/examples" directory.

We would love to hear about your interest in ZKPDL and Cashlib. Feel free to contact us if you have any questions or comments!

Chris Erway cce@cs.brown.edu Sarah Meiklejohn smeiklej@cs.ucsd.edu

The Brownie Points project brownie@cs.brown.edu http://www.cs.brown.edu/research/brownie/