Welcome to the resource topic for 2023/1185
Title:
SwiftRange: A Short and Efficient Zero-Knowledge Range Argument For Confidential Transactions and More
Authors: Nan Wang, Sid Chi-Kin Chau, Dongxi Liu
Abstract:Zero-knowledge range proofs play a critical role in confidential transactions (CT) on blockchain systems. They are used to prove the non-negativity of committed transaction payments without disclosing the exact values. Logarithmic-sized range proofs with transparent setups, e.g., Bulletproofs, which aim to prove a committed value lies in the range [0, 2^N-1] where N is the bit length of the range, have gained growing popularity for communication-critical blockchain systems as they increase scalability by allowing a block to accommodate more transactions. In this paper, we propose SwiftRange, a new type of logarithmic-sized zero-knowledge range argument with a transparent setup in the discrete logarithm setting. Our argument can be a drop-in replacement for range proofs in blockchain-based confidential transactions. Compared with Bulletproofs, our argument has higher computational efficiency and lower round complexity while incurring comparable communication overheads for CT-friendly ranges, where N \in \{32,64\}. Specifically, a SwiftRange achieves 1.61$\times$ and 1.32$\times$ proving efficiency with no more than 1.1$\times$ communication costs for both ranges, respectively. More importantly, our argument offers a 2.3\times increase in verification efficiency. Furthermore, our argument has a smaller size when N \leq 16, making it competitive for many other communication-critical applications. Our argument supports the aggregation of multiple single arguments for greater efficiency in communication and verification. Finally, we benchmarked our argument against the state-of-the-art range proofs to demonstrate its practicality.
ePrint: https://eprint.iacr.org/2023/1185
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