关键词: 区块链, 零知识证明, 椭圆曲线, 电子拍卖, 智能合约

Abstract: Current electronic auctions have the contradictory problems of third party untrustworthiness and the winning bidder’s need to guarantee both anonymity and legitimacy of identity. To address the above problems, a sealed bidding auction scheme based on noninteractive zeroknowledge proof and nonhomogenized tokens is proposed. First, the auction environment of peertopeer participation is constructed through the characteristics of blockchain decentralization and data tampering, and the bidders’ bids are encrypted by elliptic curve+AES algorithm, so as to improve the privacy of the eauction; and then, the generation and verification of the identity legitimacy of the winning bidder in the case of onchain anonymity are realized through noninteractive zeroknowledge proof. At the same time, the identity legitimacy is used as the elemental material of nonhomogenized tokens to ensure the winning bidder’s ownership of the identity legitimacy authentication on the chain; finally, the experimental results prove that the algorithms used outperform the RSA and ECC algorithms in terms of encryption and decryption efficiency, and the required storage overhead for identity authentication is lower than that of other comparative schemes, which meets the needs of daily auctions.

Key words: blockchain, zeroknowledge proof, elliptic curve, electronic auction, smart contracts