[DiogenesLamp]

The architecture assures that the Secure Enclave is invisible to the RAM and the A7 processor.

And where in the IPhone 5C (which uses the A6 processor) is this secure enclave?

[Swordmaker]

And where in the IPhone 5C (which uses the A6 processor) is this secure enclave?

With the A6, the secure area is in the Boot ROM's Silicon. . . it was not yet named the Secure Enclave. There was also a section of the A6 processor which was walled off, not as secure as it would be later with the Secure Enclave, but if foreshadowed what was coming. iOS 9 takes advantage of those when running on the A6.