Support for FBE or FDE on external sd card ?

[yilksd]

Some old devices have built-in feature to encrypt external sd card, but it seems devices shipped with FBE don't have this feature. I know I can add part /dev/block/mmcblk1p2--L,KEY /mnt/mmcblk1p2 to /data/adb/fbind/config.txt, but this file is is in device-encrypted (DE) storage, not CE, so it is not password-protected. I can read this file without password in twrp.

[VR-25]

Will see.
I'll have to study this encryption mechanism.