ZDNet has found a “USB Restricted Mode” in the files for iOS 11.4, a feature that could have potentially massive implications. This feature disallows USB devices from accessing the phone if it hasn’t been unlocked in the last seven days. This could potentially work to stop intrusion devices, such as the Gray Key device, from functioning with iPhones in this mode.
Gray Key
Gray Key devices attempt to break into iPhones by guessing every permutation of the possible password. However, these devices require a connection through the Lightning port, and as such could be disabled by USB Restricted Mode. This could serve as an excellent security feature for iPhone users, ensuring that only individuals with the correct password access their phone.
Law Enforcement
Apple has notoriously clashed with law enforcement agencies in the past over encryption. Agencies have repeatedly requested that Apple provide or create a skeleton key of sorts capable of opening any iPhone. The use of such a key would allow law enforcement to access suspected criminals’ phones in an attempt to obtain incriminating evidence. Apple has had (understandable) reservations about the ethics of such a key.
Where USB Restricted Mode Fits In
While it is possible that USB Restricted Mode is something more experimental and less directed specifically at law enforcement, it would make sense if it was specifically a response to this ongoing struggle. In any event, any features that protect user privacy are good features: there is no guarantee that Gray Key devices don’t fall into the wrong hands. Having features that protect users from such malicious access to their devices is clearly a high priority to Apple, and it will likely continue to pursue similar initiatives in the future.
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