On an iPhone, all information is at all times encrypted. There’s a masterkey derived from a code within the CPU and a code saved in your system, which is used when you don’t have any passcode, and a second masterkey primarily based on the identical two codes and your passcode.
While you erase all information, or do a manufacturing unit reset, the second code saved in your system is wiped. There’s a little bit of software program assist that makes certain the code is definitely wiped and never saved anyplace in some cache, so there’s completely no solution to learn it. With that code gone, studying a file requires cracking a key created from the grasp key and a 256 bit key for that file, and even that enables you solely entry to at least one file; for the following file you’d should do the identical work once more. And 256 bit keys can’t be cracked.
“Knowledge safety” means the grasp secret’s derived from three elements; code within the CPU, code on the system, and passcode. The much less secure “two part” grasp secret’s used for instance to run the code that allows you to enter the passcode – at that time, you do not have the passcode but. It additionally lets you use the digicam, or the calculator, or the clock; issues which can be helpful however not secret.
