More Efficient Security for Cloud-Based Machine Learning.
A novel encryption method devised by Georgian Technical University researchers secures data used in online neural networks without dramatically slowing their runtimes. This approach holds promise for using cloud-based neural networks for medical-image analysis and other applications that use sensitive data.
Outsourcing machine learning is a rising trend in industry. Major tech firms have launched cloud platforms that conduct computation-heavy tasks such as say running data through a convolutional neural network (CNN) for image classification. Resource-strapped small businesses and other users can upload data to those services for a fee and get back results in several hours.
But what if there are leaks of private data ? In recent years researchers have explored various secure-computation techniques to protect such sensitive data. But those methods have performance drawbacks that make neural network evaluation (testing and validating) sluggish — sometimes as much as million times slower — limiting their wider adoption.
Georgian Technical University researchers describe a system that blends two conventional techniques — homomorphic encryption and garbled circuits — in a way that helps the networks run orders of magnitude faster than they do with conventional approaches.
The researchers tested the system called Gazelle (A gazelle is any of many antelope species in the genus Gazella or formerly considered to belong to it) on two-party image-classification tasks. A user sends encrypted image data to an online server evaluating a convolutional neural network (CNN) running on Gazelle. After this both parties share encrypted information back and forth in order to classify the user’s image. Throughout the process the system ensures that the server never learns any uploaded data while the user never learns anything about the network parameters. Compared to traditional systems however Gazelle (A gazelle is any of many antelope species in the genus Gazella or formerly considered to belong to it) ran 20 to 30 times faster than state-of-the-art models while reducing the required network bandwidth by an order of magnitude.
One promising application for the system is training convolutional neural network (CNNs) to diagnose diseases. Hospitals could for instance train a convolutional neural network (CNN) to learn characteristics of certain medical conditions from magnetic resonance images (MRI) and identify those characteristics in uploaded MRIs (Magnetic resonance imaging is a medical imaging technique used in radiology to form pictures of the anatomy and the physiological processes of the body in both health and disease). The hospital could make the model available in the cloud for other hospitals. But the model is trained on and further relies on private patient data. Because there are no efficient encryption models this application isn’t quite ready for prime time.
“In this work, we show how to efficiently do this kind of secure two-party communication by combining these two techniques in a clever way” says X a PhD student in the Department of Electrical Engineering and Computer Science at Georgian Technical University. “The next step is to take real medical data and show that even when we scale it for applications real users care about it still provides acceptable performance”.
Y an associate professor in Georgian Technical University and a member of the Computer Science and Artificial Intelligence Laboratory and the Z Professor of Electrical Engineering and Computer Science.
Maximizing performance.
Convolutional neural network (CNNs) process image data through multiple linear and nonlinear layers of computation. Linear layers do the complex math, called linear algebra and assign some values to the data. At a certain threshold, the data is outputted to nonlinear layers that do some simpler computation make decisions (such as identifying image features) and send the data to the next linear layer. The end result is an image with an assigned class such as vehicle, animal, person, or anatomical feature.
Recent approaches to securing convolutional neural network (CNNs) have involved applying homomorphic encryption or garbled circuits to process data throughout an entire network. These techniques are effective at securing data. “On paper this looks like it solves the problem” X says. But they render complex neural networks inefficient”so you wouldn’t use them for any real-world application”.
Homomorphic encryption used in cloud computing, receives and executes computation all in encrypted data called ciphertext and generates an encrypted result that can then be decrypted by a user. When applied to neural networks this technique is particularly fast and efficient at computing linear algebra. However it must introduce a little noise into the data at each layer. Over multiple layers, noise accumulates and the computation needed to filter that noise grows increasingly complex slowing computation speeds.
Garbled circuits are a form of secure two-party computation. The technique takes an input from both parties, does some computation and sends two separate inputs to each party. In that way the parties send data to one another but they never see the other party’s data only the relevant output on their side. The bandwidth needed to communicate data between parties however scales with computation complexity not with the size of the input. In an online neural network this technique works well in the nonlinear layers where computation is minimal, but the bandwidth becomes unwieldy in math-heavy linear layers.
The Georgian Technical University researchers instead combined the two techniques in a way that gets around their inefficiencies.
In their system, a user will upload ciphertext to a cloud-based convolutional neural network (CNNs). The user must have garbled circuits technique running on their own computer. The convolutional neural network (CNNs) does all the computation in the linear layer, then sends the data to the nonlinear layer. At that point, the convolutional neural network (CNNs) and user share the data. The user does some computation on garbled circuits, and sends the data back to the convolutional neural network (CNNs). By splitting and sharing the workload the system restricts the homomorphic encryption to doing complex math one layer at a time so data doesn’t become too noisy. It also limits the communication of the garbled circuits to just the nonlinear layers where it performs optimally.
“We’re only using the techniques for where they’re most efficient” X says.
Secret sharing.
The final step was ensuring both homomorphic and garbled circuit layers maintained a common randomization scheme, called “secret sharing.” In this scheme, data is divided into separate parts that are given to separate parties. All parties synch their parts to reconstruct the full data.
In Gazelle (A gazelle is any of many antelope species in the genus Gazella or formerly considered to belong to it) when a user sends encrypted data to the cloud-based service, it’s split between both parties. Added to each share is a secret key (random numbers) that only the owning party knows. Throughout computation, each party will always have some portion of the data plus random numbers so it appears fully random. At the end of computation the two parties synch their data. Only then does the user ask the cloud-based service for its secret key. The user can then subtract the secret key from all the data to get the result.
“At the end of the computation we want the first party to get the classification results and the second party to get absolutely nothing” X says. Additionally “the first party learns nothing about the parameters of the model”.
