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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 <firstname.lastname@example.org> Sarah Meiklejohn <email@example.com> The Brownie Points project firstname.lastname@example.org http://www.cs.brown.edu/research/brownie/