Apple delays plan to scan phones for child abuse

LONDON — Apple said Friday it’s delaying its plan to scan U.S. iPhones for images of child sexual abuse, saying it needs more time to refine the system before releasing it.

The company had revealed last month that it was working on a tool to detect known images of child sexual abuse, which would work by scanning files before they’re uploaded to iCloud. It also had planned to introduce a separate tool to scan users’ encrypted messages for sexually explicit content.

“Based on feedback from customers, advocacy groups, researchers, and others, we have decided to take additional time over the coming months to collect input and make improvements before releasing these critically important child safety features,” Apple said in an update posted at the top of a company webpage detailing the device-scanning plans.

Apple had said in its initial announcement that the latest changes will roll out this year as part of updates to its operating software for iPhones, Macs and Apple Watches.

Matthew Green, a top cryptography researcher at Johns Hopkins University, warned in August that the system could be used to frame innocent people by sending them seemingly innocuous images designed to trigger matches for child pornography. That could fool Apple’s algorithm and alert law enforcement.

Not long after Green and privacy advocates sounded warnings, a developer claimed to have found a way to reverseengineer the matching tool, which works by recognizing the mathematical “fingerprints” that represent an image. Green said Friday that Apple’s delay was the right move and suggested that the company talk to technical and policy communities and the general public before making such a big change.