Master keying
Master keyed lock systems generally reduce overall security.[2] The fact that some pin chambers have two shear points allows for more options when picking and it also allows for more keys to operate.Larger organizations, with more complex systems, may have several levels of master keys, where the top level key works in all of the locks in the system.Maison key systems are often found in apartment building common areas, such as main entrance or a laundry room where individual residents can use their own apartment key to access these areas.Because of the inherent lack of security in the maison key system, some jurisdictions prohibit the use of maison key systems in apartment and condominium complexes.
Master keypin tumbler locksSkeleton keyFire brigade keylocksmithinglock pickingsecurity alarmsAccess controlAuthenticationKey controlKey duplicationKey relevancePasswordPhysical securityRekeyingBittingInterchangeable coreKey blankKey codeKey retainerLockrodLocksetBored cylindrical lockMortise lockRim lockSingle-point lockingThree-point lockingBerlin keyCar keyKeychainSmart keyWarded lockPin tumbler lockDisc tumbler lockLever tumbler lockMagnetic keyed lockPadlockCombination lockRotary combination lockTime-delay combination locksTime lockTubular pin tumbler lockWafer tumbler lockElectromagnetic lockElectronic lockElectric strikeKeycard lockBicycle lockBramah lockChubb detector lockChild safety lockCrash barDead boltDoor chainKensington Security SlotKnox BoxLuggage lockNight latchPower door locksProtector lockReal-estate lock boxSteering-wheel lockThe ClubLock bumpingLocksportSlim JimSnap gunAlarm deviceAlarm monitoring centerCar alarmCard readerClosed-circuit televisionDoor securityDual loopFingerprint scannerGlass break detectorHeat detectorKey switchKeypadMiniature snap-action switchMotion detectorOccupancy sensorPassive infrared sensorPerimeter intrusion detectionPhotoelectric sensorPiezo switchPressure switchProximity cardReed switchTripwireUltrasonic transducerVandal-resistant switchWater detectorWindow securityGlossary of locksmithing termsElectromagnetic door holderExit control lockJohn M. Mossman Lock MuseumKey to the CityLock MuseumLock Museum of AmericaMusée de la SerrurePuzzle lock