ccguess(1) on Linux
The text b3c13c574e59, as Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
search for ccrypt encryption keys
Flags it lists
-
--chartable -
--continue -
--depth -
--help -
--key -
--license -
--non-printable -
--version -
-K -
-L -
-V -
-c -
-d -
-h -
-n -
-t