trapdoor

luukku

takaportti A hinged or sliding door set into a floor or ceiling.
puhekieltä Such a trap set into the floor of a stage to allow fast exits and entrances.
puhekieltä A secret method of obtaining access to a program or online system; a backdoor.
puhekieltä The special information that permits the inverse of a trapdoor function to be easily computed.
puhekieltä A door in a level for regulating the ventilating current; weather door.

(rfquotek)