Fair Exchange of Secrets

Fair Exchange of Secrets
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DOI:
10.1007/3-540-39568-7_34
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发表时间:
1984-08
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通讯作者:
Tom Tedrick
Tom Tedrick
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其他
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作者:
Tom Tedrick

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我们考虑在“密钥交换”(见[1])的背景下出现的两个问题。(1).在原始协议中,一方可以停止交换,并且在计算另一方的秘密时具有2比1的预期时间优势。为了解决这个问题,当在交换中有一个特定的点时,这个时间优势可能是关键的,我们在1983年的《国际专利商标法》(见[5])中提出了一种交换单个比特的“分数”的方法。在本文中,我们扩展了这种方法,以便将其应用于所有要交换的比特,并说明如何在更抽象的设置中使用它(如[2])。(2).本文还提出了一个解决方案,解决了当交换中的一方是“风险寻求”而另一方是“风险厌恶”时,如何保证公平交换秘密的问题。
We consider two problems which arose in the context of “The Exchange of Secret Keys” (see [1]).(1).In the original protocol, one party may halt the exchange and have a 2 to 1 expected time advantage in computing the other party’s secret. To solve this problem, when there is a particular point in the exchange where this time advantage may be critical, we presented at CRYPTO 83 (see [5]), a method for exchanging “fractions” of a single bit.In this paper we extend the method so as to apply it to all bits to be exchanged, and show how it can be used in a more abstract setting (as in [2]).(2).We also present a solution to the problem of how to ensure a fair exchange of secrets when one party in the exchange is “risk seeking”, while the other is “risk-adverse”.