What encryption algorithm does the iOS keychain use to protect data?

Question

After extensive googling I haven\'t managed to find an answer to this question¹, which is surprising, since `security through obscurity\' isn\'t really security at al

Answer 1

Every iOS device has a dedicated AES 256 crypto engine built into the DMA path between the flash storage and main system memory, making file encryption highly efficient.On A9 or later A-series processors, the flash storage subsystem is on an isolated bus that is only granted access to memory containing user data via the DMA crypto engine.