abstract:A trapdoor function is a function that is easy to compute in one direction, yet believed to be difficult to compute in the opposite direction (finding its inverse) without special information, called the "trapdoor". Trapdoor functions are widely used in cryptography.
Thedesignof the slanting valvetrap keeps the valve doortightly closedwhen the pressurefrom the backflow gets higher, allowing thevalvetrap to perform its best function.