Bringing People of Different Beliefs Together to Do UC
Bringing People of Different Beliefs Together to Do UC
复制标题
将不同信仰的人聚集在一起进行 UC
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
A. Sahai
中科院分区：
文献类型：
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作者：
Sanjam Garg;Vipul Goyal;Abhishek Jain;A. Sahai
已知的UC安全协议的构造基于不同方集体同意某些可信设置的前提。在本文中，我们考虑了以下两个有趣的问题：如果各方不想将他们所有的信任都放在一个实体(或者更广泛地说，在一个设置中)，那么实现UC是可能的吗？如果各方对他们愿意信任的东西有不同的看法，该怎么办？第一个问题只被有限地研究过，而第二个问题以前从未被考虑过。
在本文中，我们启动了一项系统的研究来回答上述问题。我们考虑一个具有多个设置实例的场景，其中系统中的每一方都有一些个人信念(给定设置方面的设置假设)。一方的信仰对应于它愿意信任的东西，而且它的安全是有保证的，因为它的信仰“有效”。考虑的问题是：“考虑到一些设置和各方(可能)不同的信念，UC安全何时才能实现？”我们提供了有关UC安全可能的设置和各方的信念的一般条件。令人惊讶的是，我们发现，当各方有不同的信念时，UC安全可以用比传统设置(各方都有共同信念)下的必要信任更有限的“信任”来实现。
Known constructions of UC secure protocols are based on the premise that different parties collectively agree on some trusted setup. In this paper, we consider the following two intriguing questions: Is it possible to achieve UC if the parties do not want to put all their trust in one entity (or more generally, in one setup)? What if the parties have a difference of opinion about what they are willing to trust? The first question has been studied in only a limited way, while the second has never been considered before.
In this paper, we initiate a systematic study to answer the above questions. We consider a scenario with multiple setup instances where each party in the system has some individual belief (setup assumption in terms of the given setups). The belief of a party corresponds to what it is willing to trust and its security is guaranteed given that its belief "holds." The question considered is: "Given some setups and the (possibly) different beliefs of all the parties, when can UC security be achieved?" We present a general condition on the setups and the beliefs of all the parties under which UC security is possible. Surprisingly, we show that when parties have different beliefs, UC security can be achieved with a more limited "trust" than what is necessary in the traditional setting (where all parties have a common belief).