A secret mechanism that enables the implementation of the reverse function
in a one-way function is called a:

A.
View.

B.
Open door.

C.
Trap door.

D.
Data diode.

Explanation:
The correct answer is Trap door. Answer view refers to a mechanism in a
database system that restricts access to certain information within the
database. The view implements the principle of least privilege.
Answer Open door is a distracter, and answer Data diode refers to a mechanism usually
in multilevel security systems that limits the flow of classified
information to one direction.