![]() Security expert and Macworld contributor Rich Mogull confirmed he had seen the change in behavior, and didn’t realize until he was asked about the restriction, which he then confirmed he hadn’t previously seen mentioned or documented. That had also been this writer’s experience. Mac 911 help column about being prompted for his passcode on both an iPad Air 2 and an iPhone 6 once or twice a week in the morning after leaving them charging overnight. Macworld was alerted to this change when reader David Shanahan emailed the These rules are in place ostensibly to prevent compelling or coercing someone to provide a fingerprint, raising the bar to demanding or cracking a passcode instead.Īn unnoticed rule, but triggering more often? The list previously included (and still includes) restarting the device, five failed fingerprint recognition attempts, receiving a remote lock command viaįind My iPhone, enrolling new fingerprints in Touch ID, and not having been unlocked in any fashion in 48 hours. If you wondered why you were being seemingly randomly prompted for your passcode (or more complicated password), this is likely the reason. It’s a rolling timeout, so each time Touch ID unlocks a device, a new eight-hour timer starts to tick down until the passcode is required. A previously undocumented requirement asks for a passcode in a very particular set of circumstances: When the iPhone or iPad hasn’t been unlocked with its passcode in the previous six days, and Touch ID hasn’t been used to unlock it within the last eight hours. When iOS 9 was released, Apple updated its list of cases in which iOS asks for a passcode even when
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