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17-Jan-2020 20:48
He said that if Facebook moved to encrypt messaging, the “possibility to flag child sexual abuse content will disappear.”Technologists at Facebook and elsewhere have been discussing ways to limit the spread of illicit content on a system that uses encryption, but it is proving a thorny problem.Guy Rosen, Facebook’s vice president for integrity, said at the Stanford conference that the company would rely on “signals” that could indicate the spread of abuse imagery even if Facebook was unable to see it — when users tried to distribute messages to large groups, for example. Farid, the professor who helped build the detection technology, said that would be inadequate.“And the companies, you know, they’re just not as engaged on the issue as they really need to be.”The New York Times reported on Saturday that Facebook Messenger, which is not encrypted, accounted for nearly two-thirds of reports last year of online child sexual abuse imagery.
There is increasing “international consensus, at least among law enforcement folks, that this is a serious problem,” said Sujit Raman, an associate deputy attorney general in the Justice Department.
He suggested scanning for abuse content by making a fingerprint of an image before the message was encrypted, and then comparing the fingerprint with a database of known illegal material.“I don’t think there’s a technical barrier here,” Dr. “They’re doing this because they want to avoid liability.”Multiple cryptography experts said the practice would significantly weaken the privacy benefits of end-to-end encryption on images, however.“They’re saying it’s O. to open it up to hackers or Chinese censorship,” said Ms. “That system right there is very similar to how Chinese browsers implement censorship.”Alex Stamos, a Stanford professor who arranged the conference, and Facebook’s former chief information security officer, acknowledged that all the proposals involved trade-offs.