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Apple to scan iPhones for child sex abuse images

Apple has announced details of a system to find child sexual abuse material (CSAM) on customers’ devices.

Before an image is stored onto iCloud Photos, the technology will search for matches of already known CSAM.

Apple said that if a match is found a human reviewer will then assess and report the user to law enforcement.

However there are privacy concerns that the technology could be expanded to scan phones for prohibited content or even political speech.

Experts worry that the technology could be used by authoritarian governments to spy on its citizens.

Apple said that new versions of iOS and iPadOS – due to be released later this year – will have “new applications of cryptography to help limit the spread of CSAM online, while designing for user privacy”.

The system works by comparing pictures to a database of known child sexual abuse images compiled by the National Center for Missing and Exploited Children (NCMEC) and other child safety organisations.

Those images are translated into “hashes”, numerical codes that can be “matched” to an image on an Apple device.

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Apple says the technology will also catch edited but similar versions of original images.

‘High level of accuracy’

“Before an image is stored in iCloud Photos, an on-device matching process is performed for that image against the known CSAM hashes,” Apple said.

The company claimed the system had an “extremely high level of accuracy and ensures less than a one in one trillion chance per year of incorrectly flagging a given account”.

Apple says that it will manually review each report to confirm there is a match. It can then take steps to disable a user’s account and report to law enforcement.

The company says that the new technology offers “significant” privacy benefits over existing techniques – as Apple only learns about users’ photos if they have a collection of known CSAM in their iCloud Photos account.

However some privacy experts have voiced concerns.

“Regardless of what Apple’s long term plans are, they’ve sent a very clear signal. In their (very influential) opinion, it is safe to build systems that scan users’ phones for prohibited content,” Matthew Green, a security researcher at Johns Hopkins University, said.

“Whether they turn out to be right or wrong on that point hardly matters. This will break the dam — governments will demand it from everyone.”

www.bbc.co.uk

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