YESTERDAY, APPLE CEO TIM COOK published an open letter opposing a court order to build the FBI a “backdoor” for the iPhone.
Cook wrote that the backdoor, which removes limitations on how often an attacker can incorrectly guess an iPhone passcode, would set a dangerous precedent and “would have the potential to unlock any iPhone in someone’s physical possession,” even though in this instance, the FBI is seeking to unlock a single iPhone belonging to one of the killers in a 14-victim mass shooting spree in San Bernardino, California, in December.
It’s true that ordering Apple to develop the backdoor will fundamentally undermine iPhone security, as Cook and other digital security advocates have argued. But it’s possible for individual iPhone users to protect themselves from government snooping by setting strong passcodes on their phones — passcodes the FBI would not be able to unlock even if it gets its iPhone backdoor.
The technical details of how the iPhone encrypts data, and how the FBI might circumvent this protection, are complex and convoluted, and are being thoroughly explored elsewhere on the internet. What I’m going to focus on here is how ordinary iPhone users can protect themselves.