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2. Two-person rule - Wikipedia

   en.wikipedia.org/wiki/Two-person_rule

   Two-person rule. Sealed Authenticator System safe at a missile launch control center with two crew locks. The two-person rule is a control mechanism designed to achieve a high level of security for especially critical material or operations. Under this rule, access and actions require the presence of two or more authorized people at all times.

3. 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.

4. Glossary of locksmithing terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_locksmithing_terms

   In warded locks, the key cuts bypass the wards so the key can push or pull the bolt. Key pin See bottom pin. Lock housing The lock housing is the part of the lock that does not move when the lock is opened. It is responsible for transferring the action of the key to the bolt. Master pin In a pin tumbler lock, a master pin is an optional ...

5. Electronic lock - Wikipedia

   en.wikipedia.org/wiki/Electronic_lock

   Electronic lock. An electronic lock (or electric lock) is a locking device which operates by means of electric current. Electric locks are sometimes stand-alone with an electronic control assembly mounted directly to the lock. Electric locks may be connected to an access control system, the advantages of which include: key control, where keys ...

6. Rotary combination lock - Wikipedia

   en.wikipedia.org/wiki/Rotary_combination_lock

   Rotary combination lock. A rotary dial combination padlock. A rotary combination lock is a lock commonly used to secure safes and as an unkeyed padlock mechanism. This type of locking mechanism consists of a single dial which must be rotated left and right in a certain combination in order to open the lock.

7. Permissive action link - Wikipedia

   en.wikipedia.org/wiki/Permissive_Action_Link

   The sealed authenticators are stored in a safe that has two separate locks so that a single crew member cannot open the safe alone. Both crew members must simultaneously turn the four launch keys. An additional safeguard is provided by requiring the crew in another launch control center to do the same for the missiles to be launched.