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Between a Rock and a Hard Place: Interpolating between MPC and FHE

机译:在岩石和一个硬的地方:在MPC和FHE之间插值

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We present a computationally secure MPC protocol for threshold adversaries which is parametrized by a value L. When L = 2 we obtain a classical form of MPC protocol in which interaction is required for multiplications, as L increases interaction is reduced, in that one requires interaction only after computing a higher degree function. When L approaches infinity one obtains the FHE based protocol of Gentry, which requires no interaction. Thus one can trade communication for computation in a simple way. Our protocol is based on an interactive protocol for "bootstrapping" a somewhat homomorphic encryption (SHE) scheme. The key contribution is that our presented protocol is highly communication efficient enabling us to obtain reduced communication when compared to traditional MPC protocols for relatively small values of L.
机译:我们介绍了由值L参数化的阈值对手的计算安全的MPC协议。当L = 2我们获得了一种经典形式的MPC协议,其中乘法需要相互作用,因为L增加交互,所以在那个需要交互时 仅在计算更高的程度函数之后。 当L接近Infinity时,可以获得基于FHE的绅士协议,这无需交互。 因此,可以以简单的方式交易沟通以进行计算。 我们的协议基于交互式协议,用于“自动启动”A稍微同性全相治(她)方案。 关键贡献是,我们所提出的协议是高度沟通的高效,使我们能够在与传统的MPC协议相比的用于相对较小的L值时获得降低的通信。

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