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Filesystem Data Protection<br />
User<br />
Kernel<br />
SEP<br />
open(“foo.txt”, …)<br />
1. Fetch wrapped<br />
file_key from<br />
metadata<br />
HFS<br />
Key Store<br />
2. Unwrap file_key<br />
using keybag key<br />
4. Send IO<br />
command <strong>with</strong><br />
ephemerally<br />
wrapped <br />
file_key<br />
NVME Driver<br />
Clear Text<br />
AES Engine<br />
3. Wrap file_key using<br />
ephemeral_key,<br />
return ephemerally<br />
wrapped file_key <br />
to kernel<br />
Hardware<br />
NAND<br />
Cipher Text<br />
Storage<br />
Controller<br />
Ephemeral Key<br />
established on boot
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