BY PATRICK TUCKER
Step 1: Use AI to make undetectable changes to outdoor photos. Step 2: release them into the open-source world and enjoy the chaos.
Worries about deep fakes — machine-manipulated videos of celebrities and world leaders purportedly saying or doing things that they really didn’t — are quaint compared to a new threat: doctored images of the Earth itself.
China is the acknowledged leader in using an emerging technique called generative adversarial networks to trick computers into seeing objects in landscapes or in satellite images that aren’t there, says Todd Myers, automation lead for the CIO-Technology Directorate at the National Geospatial-Intelligence Agency.
“The Chinese are well ahead of us. This is not classified info,” Myers said Thursday at the second annual Genius Machinessummit, hosted by Defense One and Nextgov. “The Chinese have already designed; they’re already doing it right now, using GANs—which are generative adversarial networks—to manipulate scenes and pixels to create things for nefarious reasons.”
For example, Myers said, an adversary might fool your computer-assisted imagery analysts into reporting that a bridge crosses an important river at a given point.
“So from a tactical perspective or mission planning, you train your forces to go a certain route, toward a bridge, but it’s not there. Then there’s a big surprise waiting for you,” he said.
First described in 2014, GANs represent a big evolution in the way neural networks learn to see and recognize objects and even detect truth from fiction.
Say you ask your conventional neural network to figure out which objects are what in satellite photos. The network will break the image into multiple pieces, or pixel clusters, calculate how those broken pieces relate to one another, and then make a determination about what the final product is, or, whether the photos are real or doctored. It’s all based on the experience of looking at lots of satellite photos.
GANs reverse that process by pitting two networks against one another — hence the word“adversarial.” A conventional network might say, “The presence of x, y, and z in these pixel clusters means this is a picture of a cat.” But a GAN network might say, “This is a picture of a cat, so x, y, and z must be present. What are x, y, and z and how do they relate?” The adversarial network learns how to construct, or generate, x, y, and z in a way that convinces the first neural network, or the discriminator, that something is there when, perhaps, it is not.
A lot of scholars have found GANs useful for spotting objects and sorting valid images from fake ones. In 2017, Chinese scholars used GANs to identify roads, bridges, and other features in satellite photos.
The concern, as AI technologists told Quartz last year, is that the same technique that can discern real bridges from fake ones can also help create fake bridges that AI can’t tell from the real thing.
Myers worries that as the world comes to rely more and more on open-source images to understand the physical terrain, just a handful of expertly manipulated data sets entered into the open-source image supply line could create havoc. “Forget about the [Department of Defense] and the [intelligence community]. Imagine Google Maps being infiltrated with that, purposefully? And imagine five years from now when the Tesla [self-driving] semis are out there routing stuff?” he said.
When it comes to deep fake videos of people, biometric indicators like pulse and speech can defeat the fake effect. But faked landscape isn’t vulnerable to the same techniques.
Even if you can defeat GANs, a lot of image-recognition systems can be fooled by adding small visual changes to the physical objects in the environment themselves, such as stickers added to stop signs that are barely noticeable to human drivers but that can throw off machine vision systems, as DARPA program manager Hava Siegelmann has demonstrated.
Myers says the military and intelligence community can defeat GAN, but it’s time-consuming and costly, requiring multiple, duplicate collections of satellite images and other pieces of corroborating evidence. “For every collect, you have to have a duplicate collect of what occurred from different sources,” he said. “Otherwise, you’re trusting the one source.”
The challenge is both a technical and a financial one.
“The biggest thing is the funding required to make sure you can do what I just talked about,” he said.
On Thursday, U.S. officials confirmed that data integrity is a rising concern. “It’s something we care about in terms of protecting our data because if you can get to the data you can do the poisoning, the corruption, the deceiving and the denials and all of those other things,” said Lt. Gen. Jack Shanahan, who runs the Pentagon’s new Joint Artificial Intelligence Center. “We have a strong program protection plan to protect the data. If you get to the data, you can get to the model.”
But when it comes to protecting open-source data and images, used by everybody from news organizations to citizens to human rights groups to hedge funds to make decisions about what is real and what isn’t, the question of how to protect it is frighteningly open. The gap between the “truth” that the government can access and the “truth” that the public can access may soon become unbridgeable, which would further erode the public credibility of the national security community and the functioning of democratic institutions.
Andrew Hallman, who heads the CIA’s Digital Directorate, framed the question in terms of epic conflict. “We are in an existential battle for truth in the digital domain,” Hallman said. “That’s, again, where the help of the private sector is important and these data providers. Because that’s frankly the digital conflict we’re in, in that battle space…This is one of my highest priorities.”
When asked if he felt the CIA had a firm grasp of the challenge of fake information in the open-source domain, Hallman said, “I think we are starting to. We are just starting to understand the magnitude of the problem.”
No comments:
Post a Comment