Abstract

ABSTRACT Auditing the trading history of an investment fund is an effective guard against financial frauds. But how can it be performed publicly, in real time, and without disclosing any commercial secret of a fund? In 2020, Luthra et al. developed ZeroAUDIT , a customized zero-knowledge protocol based on Merkle tree, which can assert that the accrued profit of an investment fund is as claimed given commitment/encryption of its transaction records. It was believed that a customized protocol has much better performance than general purpose zk-proof systems. In this work, we show that it is not true. We present ZeroAUDI T GEN , a polymorphic zk-proof system for the same zk-audit problem, over a variety of general purpose zk-proof systems. We show that the prover and verifier cost can be greatly reduced by appropriate choice of security assumptions and design of concrete cryptographic constructions.

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