I&#x27;m under the impression that this &quot;backdoor&quot; is the fact that these phones can download updates to the OS.  The phone checks that the update is signed by Apple.  If Apple can be trusted to keep their code-signing keys secret, then surely they can be trusted to keep a special version of the OS secret.<p>I&#x27;m still opposed to this, though...  The FBI wants to be able to dictate to a private company what features to build (because of the All Writs Act).