There are at least two different kinds of encryption at work on Apple mobile products. The one that this knowledge base is discussing, is a crypto accelerator f

There are at least two different kinds of encryption at work on Apple mobile products. The one that this knowledge base is discussing, is a crypto accelerator framework that allows you to quickly do high-quality encryption on a segment of data. However there is also fundamental encryption placed on the solid-state flash assembly that drives all iOS devices. It is not user accessible, it does not rely on user visible passwords, and guarantees that when the device is off, the filesystem cannot be read. The first generation of Windows 7 devices did not offer hardware file system encryption, ironically keeping them from connecting to most Microsoft exchange installations.