Cool! Sounds like a good idea. A key stretcher is probably a good idea too if you haven't done so. Given that this is local only, you can go pretty nuts on the

Cool! Sounds like a good idea. A key stretcher is probably a good idea too if you haven't done so. Given that this is local only, you can go pretty nuts on the key stretching. For example, on a server I'd say >100K rounds of PBKDF2. For local, you could do 1B.