Trap doors are trapdoors. They belong to the potential dangers of IT systems. This is a hidden functionality that attempts to penetrate or bypass the security functions of an IT system.
A trap door or backdoor is an implemented sequence of commands for an attack on an IT system. Trap doors are also used to test programs or deliberately installed by developers to gain unauthorized access to the system at a later date. Such trap doors are activated by a certain string or event sequence of a client or server
. Trap door functions are relatively easy to calculate, but without the knowledge of the secret key it is not possible to calculate the corresponding argument (x) from the functional value (y).