The latest cybercrime turns security systems against you — and there’s no good defense

For a brief period last week, Telegram disappeared from Apple’s App Store. That is no small thing. Telegram has more than a billion users worldwide, and for anyone who tried to install Telegram on an iPhone, Apple had temporarily cut off the normal route to getting the app. Apple said it removed Telegram after finding child sexual abuse material on the service. Telegram deleted the material, banned the offending user, and Apple restored the app the same day. Existing users were able to keep using Telegram while it was unavailable for download.

That alone would have been a noteworthy story, but Telegram founder Pavel Durov later offered a much stranger explanation for what happened. According to Durov, the material was not simply posted by some random