An Unlinkable Divisible Electronic Cash Using Secure Proxy Computation for DL One-way Function (特集:新たな脅威に立ち向かうコンピュータセキュリティ技術)
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概要
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Electronic cash (e-cash) should satisfy the unlinkability and divisibility, for the privacy protection and the convenience, respectively. The unlinkability means the infeasibility of determining whether two payments are made by the same customer. The divisibility means that an e-coin can be divided to spent, and thus the exact payments are available. In the existing unlinkable divisible e-cash system, the customer suffers from the inefficiency of the payment protocol, because of the vast computations of zero-knowledge proofs. This paper proposes an improved system, where the customer's load is vastly reduced. Instead of the customer, the proofs are computed by the active proxies, called trustees. As a side result, the distributed proxy computation protocol for a DL one-way function is "also proposed. In the protocol, given a ciphertext of a value a, a quorum of parties verifiably computes a ciphertext of f(a) that is a discrete log type of one-way function, without revealing a and f(a).
- 一般社団法人情報処理学会の論文
- 2003-08-15
著者
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Nakanishi Toru
Department Of Biochemistry Nagoya University School Of Medicine
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Nakanishi Toru
Department Of Communication Network Engineering Faculty Of Engineering Okayama University
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Sugiyama Yuji
Department Of Communication Net Work Engineering Faculty Of Engineering Okayama University
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