History Main / TwoKeyedLock

16th May '18 5:27:26 PM JackG
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* In ''Film/DrStrangelove,'' the pilot, bombadier and electronic warfare officer each have to have to operate the first and second safety switches to arm the bombs.

to:

* In ''Film/DrStrangelove,'' the pilot, bombadier bombardier and electronic warfare officer each have to have to operate the first and second safety switches to arm the bombs.



** Played with in the episode "Cathexis". An alien consciousness is floating around ''Voyager'', possessing various people long enough for them to enter various commands in their computer, then moving on. At one point Janeway considers dividing the command codes between herself and the security chief, as the alien can only possess one person at a time.



** In another episode three nuclear launch officers station in nuclear missile silos are revealed to be moles for a radical organization. Two of them end up stationed at the same silo but a failsafe prevents them from launching their missile without an authorization from the President. However, the system has an override that can be activated by the two launch officers of another silo. One of those people is also a mole so he kills his partner and then gets around the two key lock by using a mechanical device that turns both keys at the same time.

to:

** In another episode three nuclear launch officers station stationed in nuclear missile silos are revealed to be moles for a radical organization. Two of them end up stationed at the same silo but a failsafe prevents them from launching their missile without an authorization from the President. However, the system has an override that can be activated by the two launch officers of another silo. One of those people is also a mole so he kills his partner and then gets around the two key lock by using a mechanical device that turns both keys at the same time.
31st Mar '18 2:09:53 PM nombretomado
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* ''[[Franchise/FatalFrame Fatal Frame II / Project Zero 2]]'' has a couple of places where the twins have to stand on pressure pads to unlock certain doors. Seeing as the village had been completely cut off from modern technology it's rather out of place to the general rural-rustic style.

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* ''[[Franchise/FatalFrame ''[[VideoGame/FatalFrameIICrimsonButterfly Fatal Frame II / Project Zero 2]]'' has a couple of places where the twins have to stand on pressure pads to unlock certain doors. Seeing as the village had been completely cut off from modern technology it's rather out of place to the general rural-rustic style.
25th Mar '18 8:12:35 PM AFP
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* Multi-factor authentication is a variation on this idea, where one person is expected to hold all of the keys. The keys themselves are several different types that cannot all be stolen the same way (something you know, such as a password; something you have, such as a mobile phone; and/or something you "are", such as a fingerprint) to greatly decrease the possibility of an impostor gaining access.

to:

* Multi-factor authentication is a variation on this idea, where one person is expected to hold all of the keys. The keys themselves are several different types that cannot all be stolen the same way (something you know, such as a password; password or a PIN; something you have, such as a mobile phone; phone or an ID card; and/or something you "are", such as a fingerprint) fingerprint or retinal scan) to greatly decrease the possibility of an impostor gaining access.
23rd Feb '18 12:39:22 PM Kartoonkid95
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Added DiffLines:

* ''WesternAnimation/GravityFalls'': In "Not What He Seems", Dipper, Mabel and Soos turn three keys together to reveal [[spoiler: the emergency shutdown button for the interdimensional portal]].
22nd Feb '18 1:19:30 PM StFan
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->'''Dr. Petrov''': Sir! The reason for having two keys is so that no one man may...\\
'''Captain Ramius''': May what, Doctor?\\
'''Dr. Petrov''': Arm the missiles Captain.\\
'''Captain Ramius''': Mmm, thank you for your concern, Doctor.

to:

->'''Dr. Petrov''': Petrov:''' Sir! The reason for having two keys is so that no one man may...\\
'''Captain Ramius''': Ramius:''' May what, Doctor?\\
'''Dr. Petrov''': Petrov:''' Arm the missiles missiles, Captain.\\
'''Captain Ramius''': Ramius:''' Mmm, thank you for your concern, Doctor.



* In episode 13 of ''Anime/NeonGenesisEvangelion'', an Angel infiltrates NERV's computer system and Gendo tries to be GenreSavvy.
-->'''Gendo:''' Shut down the I/O system.\\
''(Hyuga and Aoba insert keys into their respective slots)''\\
'''Hyuga:''' Three! Two! One! ''(keys are turned)''\\
''(beat)''\\

to:

* ''Anime/NeonGenesisEvangelion'':
**
In episode 13 of ''Anime/NeonGenesisEvangelion'', 13, an Angel infiltrates NERV's computer system and Gendo tries to be GenreSavvy.
-->'''Gendo:''' --->'''Gendo:''' Shut down the I/O system.\\
''(Hyuga ''[Hyuga and Aoba insert keys into their respective slots)''\\
slots]''\\
'''Hyuga:''' Three! Two! One! ''(keys ''[keys are turned)''\\
''(beat)''\\
turned]''\\
''[beat]''\\



** Then a few minutes later Maya and Ritsuko do this to [[RapidFireTyping hack into the Angel through Casper]] while [[BeatThemAtTheirOwnGame Casper is being hacked by the Angel in turn]]. They enter the final command simultaneously and it works, killing the Angel and disarming the MAGI's self-destruct sequence [[AlwaysClose a single second before it could blow the entire base to kingdom come]].

to:

** Then a few minutes later later, Maya and Ritsuko do this to [[RapidFireTyping hack into the Angel through Casper]] while [[BeatThemAtTheirOwnGame Casper is being hacked by the Angel in turn]]. They enter the final command simultaneously and it works, killing the Angel and disarming the MAGI's self-destruct sequence [[AlwaysClose a single second before it could blow the entire base to kingdom come]].



[[folder: Fan Works]]

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[[folder: Fan [[folder:Fan Works]]



[[folder:Films -- Animated]]

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[[folder:Films -- Animated]]Animation]]



* In ''WesternAnimation/MyLittlePonyEquestriaGirlsForgottenFriendship'', Celestia and Luna open the BookcasePassage by pulling on a pair of books. Each one uses her own telekinesis to move the book with her respective cutie mark on the spine. Since it should be trivially easy for either of them to do both at the same time, this hints that there is a security system requiring the two alicorns to work in tandem to get access to the restricted section of the library.



* ''Bellman & True'' (and SameStoryDifferentNames ''The Real McCoy'') has a two-key lock to enable or disable the elevator. During a five minute phase for the bank break in, they spend most of the time trying to figure out which of the keys open the elevator, in addition to discovering the order in which the keys are turned.

to:

* ''Bellman & True'' (and SameStoryDifferentNames ''The Real McCoy'') [=McCoy=]'') has a two-key lock to enable or disable the elevator. During a five minute phase for the bank break in, they spend most of the time trying to figure out which of the keys open the elevator, in addition to discovering the order in which the keys are turned.



* One can actually see this decay in ''Franchise/StarTrek''. In the days of the original series, voice-print match and codes from three senior officers are necessary to activate the auto-destruct sequence. In the Next-Gen days, it only only takes two with biometric hand scans, and requires both to disable it. By the time of Voyager, Janeway could apparently destroy the entire ship on a whim.

to:

* ''Franchise/StarTrek'':
**
One can actually see this decay in ''Franchise/StarTrek''.the franchise. In the days of the original series, voice-print match and codes from three senior officers are necessary to activate the auto-destruct sequence. In the Next-Gen days, it only only takes two with biometric hand scans, and requires both to disable it. By the time of Voyager, Janeway could apparently destroy the entire ship on a whim.



* In ''Series/StargateSG1'', the passwords of two officers are required to cancel the SelfDestructMechanism.
** It varies. In "Menace", Hammond and Carter turn it on and off with keys. In "Lockdown", O'Neill and Kearney turn it on with keys. In "Lockdown" and "Avatar", Carter turns it off in the control room by tapping the computer a bit.
** Once on ''Stargate'', a possessed O'Neill tells another guy at gunpoint to insert his key, which struck me as defeating the purpose - you'd think they'd tell the people with keys to die rather than be coerced.
*** Well, they ''do.'' HeroicSacrifice is easier said than done, ya know.
** Putting this trope into effect in ''Series/StargateSG1'' could almost have been considered a plot thread of its own during the first two seasons or so. In the movie and until the events of the pilot, the SGC had a hair-trigger on the self-destruct button and the gate's iris, because the primary priority was keeping everything alien out. In the show, though, they start bringing stuff back for study and all kinds of other reasons, and of course, it's stuff they don't fully understand that's often hostile. A TwoKeyedLock is needed to stop PuppeteerParasite, a handprint scanner is needed to stop cloaked aliens, and so on.

to:

* In ''Series/StargateSG1'', the ''Series/StargateSG1'':
** The
passwords of two officers are required to cancel the SelfDestructMechanism.
** It varies. In
SelfDestructMechanism. Though it varies: in "Menace", Hammond and Carter turn it on and off with keys. In "Lockdown", O'Neill and Kearney turn it on with keys. In "Lockdown" and "Avatar", Carter turns it off in the control room by tapping the computer a bit.
** Once on ''Stargate'', a possessed O'Neill tells another guy at gunpoint to insert his key, which struck me as is defeating the purpose - -- you'd think they'd tell the people with keys to die rather than be coerced.
*** Well, they ''do.'' HeroicSacrifice is easier said than done, ya know.
** Putting this trope into effect in ''Series/StargateSG1'' could almost have been considered a plot thread of its own during the first two seasons or so. In the movie and until the events of the pilot, the SGC had a hair-trigger on the self-destruct button and the gate's Gate's iris, because the primary priority was keeping everything alien out. In the show, though, they start bringing stuff back for study and all kinds of other reasons, and of course, it's stuff they don't fully understand that's often hostile. A TwoKeyedLock is needed to stop PuppeteerParasite, a handprint scanner is needed to stop cloaked aliens, and so on.



* ''VisualNovel/{{Snatcher}}'' has a '''three'''-keyed one in located in Queens Hospital.



* ''VisualNovel/HotelDuskRoom215'' has you fix the lights to a room, which requires that you turn on both switches required to allow the lights to turn on at the same time. This would be fine if it weren't that the touch screen works against you.



[[folder:Web Comics]]
* Used [[http://www.goblinscomic.org/01032009/ here]] in ''Webcomic/{{Goblins}}: Life Through Their Eyes'', with a four-key system. [[spoiler:[[CuttingTheKnot A giant just smashes the door open for them]], because they REALLY don't have time for puzzles.]]
* In ''Webcomic/TheMansionOfE'', Carmal uses the existence of such a system to deduce that a certain machine is more important than she had been aware.
-->'''Carmal:''' The only ''sane'' reason for the... thingamabob builders to make it that way would be... they didn't want people just ''casually'' turning it on, or changing it, or whatever the zark we're doing.\\
'''Shabash:''' Figured that out all by yourself, did ya? Yeah. The thingamabob is ''important''.

to:

[[folder:Web Comics]]
[[folder:Visual Novels]]
* Used [[http://www.goblinscomic.org/01032009/ here]] ''VisualNovel/{{Snatcher}}'' has a '''three'''-keyed one in ''Webcomic/{{Goblins}}: Life Through Their Eyes'', with a four-key system. [[spoiler:[[CuttingTheKnot A giant just smashes located in Queens Hospital.
* ''VisualNovel/HotelDuskRoom215'' has you fix
the door open for them]], because they REALLY don't have time for puzzles.]]
* In ''Webcomic/TheMansionOfE'', Carmal uses the existence of such a system
lights to deduce a room, which requires that a certain machine is more important than she had been aware.
-->'''Carmal:''' The only ''sane'' reason for the... thingamabob builders
you turn on both switches required to make it that way allow the lights to turn on at the same time. This would be... they didn't want people just ''casually'' turning be fine if it on, or changing it, or whatever the zark we're doing.\\
'''Shabash:''' Figured
weren't that out all by yourself, did ya? Yeah. The thingamabob is ''important''.the touch screen works against you.



[[folder:Web Original]]
* ''WebVideo/AtopTheFourthWall'' uses the exact self-destruct code from Star Trek III in the ColdOpen for his review of... the comic adaptation of Star Trek III in order to [[spoiler:prevent Lord Vyce from taking his ship back. Vyce manages to stop the sequence before the ship blows up.]]
** Possibly unique in that one of the people who confirms the code is ''the ship's AI''. Linkara makes it clear that he's not asking her to help kill herself, though, as she can transfer her consciousness off the ship.
* In ''Webcomic/AxeCop'' when they're visiting Magic World they have to insert two magic wands on the side of a gate at the same time to get in. [[http://axecop.com/index.php/acepisodes/read/episode_105/ Not that they get very far after that point]].

to:

[[folder:Web Original]]
* ''WebVideo/AtopTheFourthWall'' uses the exact self-destruct code from Star Trek III in the ColdOpen for his review of... the comic adaptation of Star Trek III in order to [[spoiler:prevent Lord Vyce from taking his ship back. Vyce manages to stop the sequence before the ship blows up.]]
** Possibly unique in that one of the people who confirms the code is ''the ship's AI''. Linkara makes it clear that he's not asking her to help kill herself, though, as she can transfer her consciousness off the ship.
* In ''Webcomic/AxeCop'' when they're visiting Magic World they have to insert two magic wands on the side of a gate at the same time to get in. [[http://axecop.com/index.php/acepisodes/read/episode_105/ Not that they get very far after that point]].
Animation]]



* Joked about in a [[http://what-if.xkcd.com/104/ "What If"]] on ''WebComic/{{xkcd}}'' with the National Weather Service having a special snow measuring board;
-->''It's snowing. We'd better go get the board''\\
''Ok. You'll need to come along since we need two people to turn the keys to access it.''



[[folder:Web Comics]]
* Used [[http://www.goblinscomic.org/01032009/ here]] in ''Webcomic/{{Goblins}}: Life Through Their Eyes'', with a four-key system. [[spoiler:[[CuttingTheKnot A giant just smashes the door open for them]], because they REALLY don't have time for puzzles.]]
* In ''Webcomic/TheMansionOfE'', Carmal uses the existence of such a system to deduce that a certain machine is more important than she had been aware.
-->'''Carmal:''' The only ''sane'' reason for the... thingamabob builders to make it that way would be... they didn't want people just ''casually'' turning it on, or changing it, or whatever the zark we're doing.\\
'''Shabash:''' Figured that out all by yourself, did ya? Yeah. The thingamabob is ''important''.
* Joked about in a [[http://what-if.xkcd.com/104/ "What If"]] on ''WebComic/{{xkcd}}'' with the National Weather Service having a special snow measuring board:
-->"It's snowing. We'd better go get the board."\\
"OK. You'll need to come along since we need two people to turn the keys to access it."
* In ''Webcomic/AxeCop'' when they're visiting Magic World they have to insert two magic wands on the side of a gate at the same time to get in. [[http://axecop.com/index.php/acepisodes/read/episode_105/ Not that they get very far after that point]].
[[/folder]]

[[folder:Web Original]]
* ''WebVideo/AtopTheFourthWall'' uses the exact self-destruct code from ''Star Trek III'' in the ColdOpen for his review of... the comic adaptation of ''Star Trek III'' in order to [[spoiler:prevent Lord Vyce from taking his ship back. Vyce manages to stop the sequence before the ship blows up.]] Possibly unique in that one of the people who confirms the code is ''the ship's AI''. Linkara makes it clear that he's not asking her to help kill herself, though, as she can transfer her consciousness off the ship.
[[/folder]]



* The Fire Temple's inner sanctum in ''WesternAnimation/AvatarTheLastAirbender'' could only be opened by five simultaneous fireblasts. A "fully realized Avatar" could do it single-handedly, but it otherwise required five powerful and fully-trained firebenders.

to:

* The Fire Temple's inner sanctum in ''WesternAnimation/AvatarTheLastAirbender'' could can only be opened by five simultaneous fireblasts. A "fully realized Avatar" could do it single-handedly, but it otherwise required requires five powerful and fully-trained firebenders.



* Ben and Kevin hacked the Omnitrix offscreen in ''WesternAnimation/Ben10UltimateAlien'' to ensure he wouldn't turn into Alien X by accident- a RealityWarper with the huge drawback of a conflicted mind that can't seem to agree on any mode of action- without using two keys to access it on the transformation options screen in case the GodzillaThreshold was crossed.

to:

* ''Franchise/Ben10'':
**
Ben and Kevin hacked the Omnitrix offscreen in ''WesternAnimation/Ben10UltimateAlien'' to ensure he wouldn't turn into Alien X by accident- a RealityWarper with the huge drawback of a conflicted mind that can't seem to agree on any mode of action- without using two keys to access it on the transformation options screen in case the GodzillaThreshold was crossed.



2nd Feb '18 10:30:17 PM infernape612
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->'''Dr. Petrov''': "Sir! The reason for having two keys is so that no one man may..."
->'''Captain Ramius''': "May what, Doctor?"
->'''Dr. Petrov''': "Arm the missiles Captain."
->'''Captain Ramius''': "Mmm, thank you for your concern Doctor."
-->-- '''The Hunt for Red October''' (1990). After Ramius takes and keeps the nuclear missile launch key from the ship's dead political officer, whom he secretly killed, meaning that he is now in possession of ''both'' launch keys.

to:

->'''Dr. Petrov''': "Sir! Sir! The reason for having two keys is so that no one man may..."
->'''Captain
\\
'''Captain
Ramius''': "May May what, Doctor?"
->'''Dr.
Doctor?\\
'''Dr.
Petrov''': "Arm Arm the missiles Captain."
->'''Captain
\\
'''Captain
Ramius''': "Mmm, Mmm, thank you for your concern Doctor."
concern, Doctor.
-->-- '''The Hunt for Red October''' (1990). After ''Film/TheHuntForRedOctober''[[note]]After Ramius takes and keeps the nuclear missile launch key from the ship's dead political officer, whom he secretly killed, meaning that he is now in possession of ''both'' launch keys.
keys.[[/note]]



-->'''Gendo:''' Shut down the I/O system.
-->''(Hyuga and Aoba insert keys into their respective slots)''
-->'''Hyuga:''' Three! Two! One! ''(keys are turned)''
-->''(beat)''
-->'''Hyuga:''' [[FailsafeFailure WE CAN'T SHUT IT DOWN!!!]]

to:

-->'''Gendo:''' Shut down the I/O system.
-->''(Hyuga
system.\\
''(Hyuga
and Aoba insert keys into their respective slots)''
-->'''Hyuga:'''
slots)''\\
'''Hyuga:'''
Three! Two! One! ''(keys are turned)''
-->''(beat)''
-->'''Hyuga:'''
turned)''\\
''(beat)''\\
'''Hyuga:'''
[[FailsafeFailure WE CAN'T SHUT IT DOWN!!!]]
21st Jan '18 4:11:04 AM EDP
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Added DiffLines:

* In ''ComicBook/PaperinikNewAdventures'', [[WellIntentionedExtremist Morgan Fairfax]] had the remote of his earthquake-generating system with two keys, of which he kept one himself and the other was given to Mary Ann Flagstarr, his bodyguard (who didn't know his plan) without telling him what it was, so Paperinik or others couldn't stop him by force but he was still able to access the key in case he found it necessary. [[CrazyPrepared Just in case, he still had a very complex set of codes in place]], something that got handy when Flagstarr realized Paperinik was telling the truth ''and'' our heroes realized the twin necklaces were the needed keys.
17th Jan '18 3:14:27 PM SpacemanSpoof
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Added DiffLines:

* Used occasionally in ''VideoGame/StarWarsTheOldRepublic'', particularly for obtaining a few of the [[RareCandy datacrons]] hidden throughout the game world. This can be rather frustrating, as it's sometimes difficult to find another player willing to perform the task with you.


Added DiffLines:

* Multi-factor authentication is a variation on this idea, where one person is expected to hold all of the keys. The keys themselves are several different types that cannot all be stolen the same way (something you know, such as a password; something you have, such as a mobile phone; and/or something you "are", such as a fingerprint) to greatly decrease the possibility of an impostor gaining access.
17th Jan '18 1:33:32 PM nielas
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Added DiffLines:

** In another episode three nuclear launch officers station in nuclear missile silos are revealed to be moles for a radical organization. Two of them end up stationed at the same silo but a failsafe prevents them from launching their missile without an authorization from the President. However, the system has an override that can be activated by the two launch officers of another silo. One of those people is also a mole so he kills his partner and then gets around the two key lock by using a mechanical device that turns both keys at the same time.
14th Oct '17 6:49:05 AM xcountryguy
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* ''Film/WarGames'', to control a nuclear launch. One officer gets held at gunpoint for refusing to turn his key when ordered, [[spoiler: even though it was just a drill]]. That inspires NORAD to turn over launch control to an AI and leads to [[AIIsACrapshoot the main plot of the movie]].

to:

* ''Film/WarGames'', to control a nuclear launch. One officer gets held at gunpoint for refusing to turn his key when ordered, [[spoiler: even [[spoiler:even though it was just a drill]]. That inspires NORAD to turn over launch control to an AI and leads to [[AIIsACrapshoot the main plot of the movie]].



** There's also a two-part code, each part memorized by [=DARPA=] chief Donald Anderson and [=ArmsTech=] president Kenneth Baker, respectively. The [=PAL=] key option is stated to be a backup, as a way to disable Rex once the code has been entered, or to enable it if the code is somehow lost. [[spoiler: Snake is led to believe Psycho Mantis extracted Anderson's code, even though it should have been impossible, while Baker gave in to Revolver Ocelot's torture. It turns out Ocelot inadvertently killed Anderson before getting him to break, requiring Decoy Octopus to impersonate him and [[BatmanGambit have Snake figure out the key system so they could activate Rex]].]]

to:

** There's also a two-part code, each part memorized by [=DARPA=] chief Donald Anderson and [=ArmsTech=] president Kenneth Baker, respectively. The [=PAL=] key option is stated to be a backup, as a way to disable Rex once the code has been entered, or to enable it if the code is somehow lost. [[spoiler: Snake [[spoiler:Snake is led to believe Psycho Mantis extracted Anderson's code, even though it should have been impossible, while Baker gave in to Revolver Ocelot's torture. It turns out Ocelot inadvertently killed Anderson before getting him to break, requiring Decoy Octopus to impersonate him and [[BatmanGambit have Snake figure out the key system so they could activate Rex]].]]



* ''VideoGame/RatchetAndClankFutureACrackInTime'' includes a variation of this. Clank must use his newly-acquired [[spoiler: ability to shift time]] to record multiple copies of himself completing various tasks (such as pressing buttons or activating platforms), usually with the end goal of opening a door at the end of a room. The actions of the copies must be perfectly timed in order for the player controlling the "real" Clank to solve the puzzle; with up to four copies working at once to complete the task, the difficulty can ramp up pretty quickly.

to:

* ''VideoGame/RatchetAndClankFutureACrackInTime'' includes a variation of this. Clank must use his newly-acquired [[spoiler: ability [[spoiler:ability to shift time]] to record multiple copies of himself completing various tasks (such as pressing buttons or activating platforms), usually with the end goal of opening a door at the end of a room. The actions of the copies must be perfectly timed in order for the player controlling the "real" Clank to solve the puzzle; with up to four copies working at once to complete the task, the difficulty can ramp up pretty quickly.



* The Thieves' Guild vault in ''[[VideoGame/TheElderScrollsVSkyrim Skyrim]]'' has one of these, with the keys being owned by the most powerful members of the guild. [[spoiler: No one realizes it's already been emptied by Guildmaster Mercer Frey, using a magical lockpick he stole from the goddess Nocturnal.]]

to:

* The Thieves' Guild vault in ''[[VideoGame/TheElderScrollsVSkyrim Skyrim]]'' has one of these, with the keys being owned by the most powerful members of the guild. [[spoiler: No [[spoiler:No one realizes it's already been emptied by Guildmaster Mercer Frey, using a magical lockpick he stole from the goddess Nocturnal.]]



* ''WebVideo/AtopTheFourthWall'' uses the exact self-destruct code from Star Trek III in the ColdOpen for his review of... the comic adaptation of Star Trek III in order to [[spoiler: prevent Lord Vyce from taking his ship back. Vyce manages to stop the sequence before the ship blows up.]]

to:

* ''WebVideo/AtopTheFourthWall'' uses the exact self-destruct code from Star Trek III in the ColdOpen for his review of... the comic adaptation of Star Trek III in order to [[spoiler: prevent [[spoiler:prevent Lord Vyce from taking his ship back. Vyce manages to stop the sequence before the ship blows up.]]
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