Cryptology ePrint Archive: Report 2019/338

Garbled Neural Networks are Practical

Marshall Ball and Brent Carmer and Tal Malkin and Mike Rosulek and Nichole Schimanski

Abstract: We show that garbled circuits are a practical choice for secure evaluation of neural network classifiers. At the protocol level, we start with the garbling scheme of Ball, Malkin & Rosulek (ACM CCS 2016) for arithmetic circuits and introduce new optimizations for modern neural network activation functions. We develop fancy-garbling, the first implementation of the BMR16 garbling scheme along with our new optimizations, as part of heavily optimized garbled-circuits tool that is driven by a TensorFlow classifier description.

We evaluate our constructions on a wide range of neural networks. We find that our approach is up to 100x more efficient than straight-forward boolean garbling (depending on the neural network). Our approach is also roughly 40% more efficient than DeepSecure (Rouhani et al., DAC 2018), the only previous garbled-circuit-based approach for secure neural network evaluation, which incorporates significant optimization techniques for boolean circuits. Furthermore, our approach is competitive with other non-garbled-circuit approaches for secure neural network evaluation.

Category / Keywords: applications / garbled circuits, neural networks

Date: received 28 Mar 2019, last revised 3 Apr 2019

Contact author: bcarmer at gmail com

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Version: 20190403:152617 (All versions of this report)

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