GAZELLE: A Low Latency Framework for Secure Neural Network Inference

Authors: 

Chiraag Juvekar, MIT MTL; Vinod Vaikuntanathan, MIT CSAIL; Anantha Chandrakasan, MIT MTL

Abstract: 

The growing popularity of cloud-based machine learning raises natural questions about the privacy guarantees that can be provided in such settings. Our work tackles this problem in the context of prediction-as-a-service wherein a server has a convolutional neural network (CNN) trained on its private data and wishes to provide classifications on clients' private images. Our goal is to build efficient protocols whereby the client can acquire the classification result without revealing their input to the server, while guaranteeing the privacy of the server's neural network.

To this end, we design Gazelle, a scalable and low-latency system for secure neural network inference, using an intricate combination of homomorphic encryption and traditional two-party computation techniques (such as garbled circuits). Gazelle makes three contributions. First, we design the Gazelle homomorphic encryption library which provides fast algorithms for basic homomorphic operations such as SIMD (single instruction multiple data) addition, SIMD multiplication and ciphertext permutation. Second, we implement the Gazelle homomorphic linear algebra kernels which map neural network layers to optimized homomorphic matrix-vector multiplication and convolution routines. Third, we design optimized encryption switching protocols which seamlessly convert between homomorphic and garbled circuit encodings to enable implementation of complete neural network inference.

We evaluate our protocols on benchmark neural networks trained on the MNIST and CIFAR-10 datasets and show that Gazelle outperforms the best existing systems such as MiniONN (ACM CCS 2017) and Chameleon (Crypto Eprint 2017/1164) by 20--30x in online runtime. When compared with fully homomorphic approaches like CryptoNets (ICML 2016), we demonstrate three orders of magnitude faster online run-time.

Open Access Media

USENIX is committed to Open Access to the research presented at our events. Papers and proceedings are freely available to everyone once the event begins. Any video, audio, and/or slides that are posted after the event are also free and open to everyone. Support USENIX and our commitment to Open Access.

Presentation Audio

BibTeX
@inproceedings {217515,
author = {Chiraag Juvekar and Vinod Vaikuntanathan and Anantha Chandrakasan},
title = {{GAZELLE}: A Low Latency Framework for Secure Neural Network Inference},
booktitle = {27th {USENIX} Security Symposium ({USENIX} Security 18)},
year = {2018},
isbn = {978-1-931971-46-1},
address = {Baltimore, MD},
pages = {1651--1669},
url = {https://www.usenix.org/conference/usenixsecurity18/presentation/juvekar},
publisher = {{USENIX} Association},
}