ZK-SecreC: a Domain-Specific Language for Zero-Knowledge Proofs

We present ZK-SECREC, a domain-specific language for zero-knowledge (ZK) proofs. We focus on its type system, making the point that this is the most appropriate mechanism for tracking information flows in a statement that is meant to be proved using a zero-knowledge protocol. The appropriateness stems from the necessary distinctions between the two involved parties and between the computations made locally or on top of the protocol. The appropriateness also stems from how the types match with the major steps of typical ZK protocols, including the generation of Common Reference Strings. We compare the type system of ZK-SECREC with those of the previously proposed languages for ZK proofs and privacy-preserving computations, and show how ZK-SECREC handles certain aspects better.