please correct me if i'm wrong but isn't this feature already there by default?
i mean, without installing anything my phone already ask for lock code each time the phone starts. and i believe sshd is not even started yet until we get pass the lock screen?

anyway it's always a great work for someone giving more option to adding extra layer of security to the phone. even myself have been considering for a while whether we can encrypt our entire home directory with ecryptfs