trapdoor function

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English[edit]

Etymology[edit]

From the idea that it is easy to fall through a trapdoor but difficult to climb back out.

Noun[edit]

trapdoor function (plural trapdoor functions)

English Wikipedia has an article on:
Wikipedia
  1. (mathematics, cryptography) A function that is easy to compute in one direction but difficult to compute in the opposite direction (finding its inverse) without special information.