MobileRead Forums - View Single Post

knc1 · 05-21-2016, 10:59 AM

This is FAT-32 on flash -
You can't 'just delete' anything -
You need to securely over-write the file, truncate it to zero length, delete it, then send a 'trim' command to the eMMC.
(You can probably safely skip the 'trim' command part on a Kindle)

= = = =

Do you want Argon2 for your pass phrase handling? (I think I can cross-compile it for the Kindle).
It can do both (with a bit of scripting) -
verify input against the stored encrypted string then if verified, derive a (never stored anywhere) crypto key from the same input.

05-21-2016, 10:59 AM	#26
knc1 Going Viral Posts: 17,212 Karma: 18210809 Join Date: Feb 2012 Location: Central Texas Device: No K1, PW2, KV, KOA	This is FAT-32 on flash - You can't 'just delete' anything - You need to securely over-write the file, truncate it to zero length, delete it, then send a 'trim' command to the eMMC. (You can probably safely skip the 'trim' command part on a Kindle) = = = = Do you want Argon2 for your pass phrase handling? (I think I can cross-compile it for the Kindle). It can do both (with a bit of scripting) - verify input against the stored encrypted string then if verified, derive a (never stored anywhere) crypto key from the same input. Last edited by knc1; 05-21-2016 at 11:03 AM.