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arXiv 1202.3052cs.CR
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一种实用的主动安全两方计算新方法

A New Approach to Practical Active-Secure Two-Party Computation

Jesper Buus Nielsen, Peter Sebastian Nordholt, Claudio Orlandi, Sai Sheshank Burra

摘要:

我们提出了一种新的方法,以实际的两方计算安全对一个积极的对手。所有先前的实用协议都是基于姚明的乱码电路。我们使用基于OT的方法,并通过OT扩展的随机预言机模型的效率。为了得到一个实用的协议,我们引入了一些新的技术,在一个更大的建设有关的输出和输入的OT。我们还报告了这种方法的实施,这表明我们的协议是更有效的比以前任何一个:对于足够大的电路,我们可以评估每秒超过20000个布尔门。例如,评估一个不经意的AES加密(约34000门)需要64秒,但当重复任务27次时,每个实例只需要不到3秒。

英文摘要:

We propose a new approach to practical two-party computation secure against an active adversary. All prior practical protocols were based on Yao's garbled circuits. We use an OT-based approach and get efficiency via OT extension in the random oracle model. To get a practical protocol we introduce a number of novel techniques for relating the outputs and inputs of OTs in a larger construction. We also report on an implementation of this approach, that shows that our protocol is more efficient than any previous one: For big enough circuits, we can evaluate more than 20000 Boolean gates per second. As an example, evaluating one oblivious AES encryption (~34000 gates) takes 64 seconds, but when repeating the task 27 times it only takes less than 3 seconds per instance.

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