based on my previous knowledge, I know that the iPhone has hardware encryption implemented on recent models. When we issue the "Erase all contents and settings" command, the encryption keys are destroyed, making the data within the device useless.
Android also provides encryption by using dm-crypt and I believe it encrypts everything when the device is in boot stage. Now let's say I reset the device to factory settings. I know that without encryption, I can recover a significant amount of data by acquiring and carving files from the physical image. However, I am wondering if there has been any research done on acquiring an encrypted image after resetting to factory settings and recovering useful data from it.
I've found that some presentations from defcon and such sort of delve into this topic but I was wondering if there is anything more concrete out there.
Thanks for the help.