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trap door

Definitions:

  1. A means of reading cryptographically protected information by the use of private knowledge of weaknesses in the cryptographic algorithm used to protect the data. See backdoor.
Sources:
CNSSI 4009-2015

  2. In cryptography, one-to-one function that is easy to compute in one direction, yet believed to be difficult to invert without special information.
Sources:
CNSSI 4009-2015