trapdoor

== English == === Alternative forms === trap door, trap-door === Etymology === From trap +‎ door. === Pronunciation === (Received Pronunciation) enPR: trăpdô, IPA(key): /ˈtræpdɔː/ (General American) enPR: trăpdôr, IPA(key): /ˈtræpdoɹ/ === Noun === trapdoor (plural trapdoors) A hinged or sliding door set into a floor or ceiling. (theater) Such a trap set into the floor of a stage to allow fast exits and entrances. (computing) A secret method of obtaining access to a program or online system; a backdoor. (mathematics, cryptography) The special information that permits the inverse of a trapdoor function to be easily computed. (mining) A door in a level for regulating the ventilating current; a weather door. ==== Synonyms ==== drop ==== Derived terms ==== ==== Translations ==== === Verb === trapdoor (third-person singular simple present trapdoors, present participle trapdooring, simple past and past participle trapdoored) (cryptography, transitive) To subvert (a cryptographic scheme) by means of a secret parameter that makes the trapdoor function easy to compute. (surgery, intransitive) To form a trapdoor deformity. === References ===