Sealed-Bid Auctions with Efficient Bids Using Secure Bit-Slicing Conversion(Cryptography and Information Security)(<Special Section>Information Theory and Its Applications)

概要

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Efficient general secure multiparty computation (MFC) protocols were previously proposed, and the combination with the efficient auction circuits achieves the efficient sealed-bid auctions with the full pri vacy and correctness. However, the combination requires that each bidder submits ciphertexts of bits representing his bid, and their zero-knowledge proofs. This cost amounts to about 80 multi-exponentiations in usual case that the bid size is 20 bits (i.e. about 1,000,000 bid prices). This paper pro poses sealed-bid auction protocols based on the efficient MFC protocols, where a bidder can submit only a single ciphertext. The bidder's cost is a few multi-exponentiations, and thus the proposed protocols are suitable for mobile bidders. A novel technique for the realization is a bit-slicing con version by multiple servers, where a single ciphertext for a bid is securely converted into ciphertexts of bits representing the bid.
社団法人電子情報通信学会の論文
2004-10-01