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  2. Mantrap (access control) - Wikipedia

    en.wikipedia.org/wiki/Mantrap_(access_control)

    A mantrap, security mantrap portal, airlock, sally port or access control vestibule is a physical security access control system comprising a small space with two sets of interlocking doors, such that the first set of doors must close before the second set opens.

  3. Trapdoor function - Wikipedia

    en.wikipedia.org/wiki/Trapdoor_function

    In theoretical computer science and cryptography, a trapdoor function is a function that is easy to compute in one direction, yet difficult to compute in the opposite direction (finding its inverse) without special information, called the "trapdoor". Trapdoor functions are a special case of one-way functions and are widely used in public-key ...

  4. Backdoor (computing) - Wikipedia

    en.wikipedia.org/wiki/Backdoor_(computing)

    Backdoor (computing) A backdoor is a typically covert method of bypassing normal authentication or encryption in a computer, product, embedded device (e.g. a home router ), or its embodiment (e.g. part of a cryptosystem, algorithm, chipset, or even a "homunculus computer"—a tiny computer-within-a-computer such as that found in Intel's AMT ...

  5. Merkle–Hellman knapsack cryptosystem - Wikipedia

    en.wikipedia.org/wiki/Merkle–Hellman_knapsack...

    The concept of public key cryptography was introduced by Whitfield Diffie and Martin Hellman in 1976. At that time they proposed the general concept of a "trap-door one-way function", a function whose inverse is computationally infeasible to calculate without some secret "trap-door information"; but they had not yet found a practical example of such a function.

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  7. Trapped-key interlocking - Wikipedia

    en.wikipedia.org/wiki/Trapped-key_interlocking

    Trapped-key interlocking. This is a trapped-key interlock on the door of an electrical switchgear cabinet. It is attached with one-way security screws to discourage casual removal, which would defeat the interlock scheme. Trapped-key interlocking utilizes locks and keys for sequential control of equipment and machinery to ensure safe operation.

  8. Revolving door - Wikipedia

    en.wikipedia.org/wiki/Revolving_door

    Revolving doors can also be used as security devices to restrict entry to a single person at a time if the spacing between the doors is small enough. This is in contrast to a normal door which allows a second person to easily "tailgate" behind an authorized person. Extreme security can require a particular type of bullet-resistant glass.

  9. Secret trap door hiding guns and drugs found in motel room - AOL

    www.aol.com/news/2014-06-05-secret-trap-door...

    Police in Grass Valley arrested 15 people Friday morning after finding guns, drugs and a trap door in a room at. Cars may pass by everyday, but what went down behind closed doors at the Holiday ...

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