Quando si verifica una cancellazione, la chiave del file system viene cancellata. È così semplice.
Pagina 11 del settembre 2015 Documento di sicurezza iOS afferma che la chiave del file system è memorizzata in NAND .
The metadata of all files in the file system is encrypted with a random key, which is created when iOS is first installed or when the device is wiped by a user. The file system key is stored in Effaceable Storage.
Effaceable Storage: A dedicated area of NAND storage, used to store cryptographic keys, that can be addressed directly and wiped securely. While it doesn’t provide protection if an attacker has physical
possession of a device, keys held in Effaceable Storage can be used as part of a key hierarchy to facilitate fast wipe and forward security.