cgio parent
The Turkish password word may be the same used for signature? I suspect so, because in Greek we have the Greek word for signature but also a Turkish loan word τζίφρα (djifra).
imza is signature while şifre is password. I imagine the conflation occurred because signatures are used like passwords for authentication...
Likewise, the monogram of the sitting english monarch (as seen on postboxes and so forth) is the "Royal Cypher".
Hmm i don’t think that one is related in Turkish — i only know of “imza” as signature, but there could also be other variants.