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{{trope|wppage=Two-man rule}}
[[File:SAS Container.png|thumb|350px|Truth in Television - as long as nobody has both keys.]]
Sometimes one man can't be trusted so certain locks require two, or more, people to unlock, simultaneously. Maybe it's the keys to the world's destruction, or the kingdom's treasure, but whatever it is it's so important you know it must be good... or really bad. Hence the '''Two-Keyed Lock'''.
 
CommonThis is common in military settings, and very much [[Truth in Television]] with [[A Nuclear Error|Nuclear Weapons]].: The places where the keys setare turned are always too far apart from each other sofor one person can'tto be able to do it alone. AnThis is an implementation of the more general military concept of "Two Person Control" (TPC).
 
A variation seen in video games, especially ones with co-op play, is a [[Stock Video Game Puzzle|stock puzzle]] that requires two characters to activate triggers in different places at the same time to complete an objective.
{{examples}}▼
 
[[The Other Wiki]] calls this a [[Two-man rule]].
== Anime & Manga ==▼
 
▲{{examples}}
▲== [[Anime]] &and [[Manga]] ==
* Goldion Crusher in ''[[GaoGaiGar]]''.
* In episode 13 of ''[[Neon Genesis Evangelion]]'', an Angel infiltrates NERV's computer system and Gendo tries to be [[Genre Savvy]].
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* The Cyclops system in ''[[Gundam Seed]]'' was so inhumane (and probably expensive, considering that it was one-shot only) that it required at least ''five'' top Earth Alliance generals' keys to turn on.
** It was actually only two in the anime, and the system was set up so that it was possible to have one person to turn both keys as long as he had them. The keys were kept on two separate generals, however.
* Apparently, the final [[Power Limiter]] placed upon [[Person of Mass Destruction|Hayate Yagami]] in ''[[Magical Girl Lyrical Nanoha]] StrikerS'' had to be removed simultaneously by [[The Brigadier|Admiral Chrono Harlaown]] and [[Good Shepherd|Knight Carim]], making it a [[Two -Keyed Lock]] even though they didn't have to be physically present near Hayate at the time.
* The mechanism for detonating KaibaCorp Island in ''[[Yu-Gi-Oh!]]!'' requires two key cards to activate.
* In ''[[Yu-Gi-Oh! GX (anime)|Yu-Gi-Oh! GX]]'', [[Big Bad| Saiou]] obtains the controls to a [[Doomsday Device]] which requires two keys to use. Before he can use them, however, his original, benevolent personality takes over. Knowing that his control is diminishing, he gives one of the keys to [[The Hero|Judai]] and the other to [[The Rival|Edo Phoenix]], pleading with both [[No Matter How Much I Beg| ''never'' to give them back]]. As he predicted, his evil side returns soon after, and for the rest of the arc, his plan focuses on getting them back.
 
== [[Comic Books]] ==▼
 
▲== Comic Books ==
* The lab where the extremist samples were kept in ''[[Iron Man]]: Extremis''. This was a key plot point.
 
== [[Film]] ==▼
 
* ''[[Terminator]] 2'', to access the vault where the arm and chip were kept. ▼
▲== Film ==
* ''[[War GamesWarGames]]'', 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 [[AIA.I. Is a Crapshoot|the main plot of the movie]].▼
▲* ''[[Terminator]] 2'', to access the vault where the arm and chip were kept.
▲* ''[[War Games]]'', 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 [[AI Is a Crapshoot|the main plot of the movie]].
* Played with in ''[[Under Siege]] 2'', where it was two passwords on computer keyboards that needed to be entered simultaneously.
* ''[[Superman III]]'', to activate a satellite positioning system; although the two keys in question needed to be inserted simultaneously, not turned.
* The nuclear missile locks in ''[[The Hunt for Red October]]'' apparently had one of these. Although we never see the locks themselves, we see Captain Ramius taking possession of both keys -- whichkeys—which, as the doctor points out, sort of defeats the point.
** In the novel, it is stated that five officers are needed to carry out a launch. It also stated that in the event of the political officer's death, the captain was ''supposed'' to take charge of his key. There were probably other standing orders as to who inherits the other keys in the event of any of the other officers with launch keys dying on a voyage as well.
** A two key (two combination in the book) system was also used on a safe in the submarine that contained the mission orders and code books.
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* The ''[[Lost in Space]]'' movie required two keys to activate the hyperdrive.
* The movie ''[[Crimson Tide]]''. Two keys needed to unlock the missile launch controls. The XO refuses the Captain's orders to unlock the controls because they lost communications before the launch order was confirmed as protocol demands. Mutiny ensues.
** One might notice that this is EXACTLY''exactly WHYwhy'' there ARE''are'' two keys.
** The Captain was in fact acting on legitimate launch orders and the XO was refusing those orders due to the possibility they had received orders to cancel the launch. The real villains of the film were the (unseen) President and Secretary of Defense, who issued nuclear launch orders with the intention of rescinding them if the situation changed. There are no take-backs in thermonuclear warfare.
* The [[James Bond]] film ''[[Golden EyeGoldenEye]]'' had this for the titular weapon as well. {{spoiler|Interestingly, this was replicated in the secret underground base as well.}}
** {{spoiler|Well, you don't want Boris setting it off early.}}
* The USS ''Enterprise'' [[Self-Destruct Mechanism|self-destruct sequence]] needed spoken confirmation from three senior officers to trigger in ''[[Star Trek III: The Search For Spock|Star Trek III the Search For Spock]]''.
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* In ''The First Great Train Robbery'', the safes holding the gold need a total of four keys to be opened.
 
== [[Literature]] ==▼
 
▲== Literature ==
* The safe deposit vault that [[Artemis Fowl]] burgles in ''The Opal Deception''.
* An escape hatch in ''[[Thursday Next]]: First Among Sequels'' has two handles which need to be turned simultaneously.{{spoiler|In a touching [[Redemption Equals Death]], Evil Thursday chooses to help Thursday escape, knowing that she herself has no way out.}}
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* In ''[[Neuromancer]]'', the artificial intelligence Wintermute can only be freed from its programming constraints if one person speaks a password into a particular compter terminal just as another one breaks through the software defenses.
 
== [[Live-Action TV]] ==▼
 
▲== Live-Action TV ==
* One can actually see this decay in ''[[Star Trek]]''. In the days of the original series, it takes codes from 3 senior officers to activate the auto-destruct sequence. In the Next-Gen days, it only takes 2 senior officers (and their hand-prints); it also takes both of them to stop the auto-destruct. By the time of Voyager, they fully avert the trope: the ship can be destroyed at the sole command of the captain. Whether this is a ''good'' idea...
** The Xindi [[Earthshattering Kaboom|planet killer]] required access codes from any three of the five members of the Council in order to fire. This would've been a useful feature {{spoiler|when three (and eventually four) of the Xindi races back out of the plan to destroy Earth. Unfortunately, the reptilians had ways around the codes.}}
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** 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.'' [[Heroic Sacrifice]] is easier said than done, ya know.
** Putting this trope into effect in ''[[Stargate SG-1]]'' 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 [[Two -Keyed Lock]] is needed to stop [[Puppeteer Parasite]], a handprint scanner is needed to stop cloaked aliens, and so on.
* Rare example not involving nukes: in an episode of ''[[Alias (TV series)|Alias]]'' set in a Romanian mental hospital, the door to get out is double-keyed, one lock on the wall to either side of a wide maintenance door, too wide for one person to turn both keys with their hands. {{spoiler|Sydney deals with this by acrobatically turning the other one with her foot.}}
* In the ''[[Doctor Who]]'' episode "Journey's End", the Earth's self destruct requires three out of five UNIT soldiers in different countries around the world to work together to activate it.
* Referenced in an episode of ''[[Seinfeld]]'', where George's girlfriend refuses to accept their break-up. Both she and Jerry compare this to launching missiles from a submarine (Jerry says it's not the same, but George's girlfriend says it is).
* In [[Battlestar Galactica (2004 TV series)|the 2000s ''[[Battlestar Galactica Reimagined]]'']], the nuclear launch tubes on [[The Battlestar|battlestars]] are controlled by two-keyed locks.
* In the ''[[Andromeda]]'' pilot episodes, Dylan gives four people he barely knows positions on his ships - because, apparently, one person cannot launch the Nova Bombs.
 
== [[Video Games]] ==▼
 
== Real Life ==▼
* [[Truth in Television]], this, especially in terms of US ICBM silos. The two key slots are far enough apart that one person can't turn both at the same time. Plus you'll need the launch codes, if they're not [[Broken Arrow (1996 film)|set to 00000000...]]
** Yes, that actually did happen.
*** [[wikipedia:Permissive Action Link|Permissive Action Link]]. Under the [[John F Kennedy|Kennedy administration]], somebody decided to put PALs on the US nuclear arsenal to prevent unauthorized firing. SAC objected to this practice, fearing the possibility that the launch codes would not be available in time of need. So, very quietly, SAC installed these devices, intended to ensure the safety of the free world, and very quietly, they set the combination on every single one of them to [[Spaceballs|00000000]]. Very trusting people, SAC.▼
**** [[Vindicated by History|Well, their trust appears to have been well placed.]]
*** The logic was that warheads mounted to missiles in either ground-based stations or in ballistic submarines are secure because of the two-man-rule interlocks, and PALs would risk a loss of readiness without significant security benefit. Actual (non-trivially-coded) PALs were (eventually) applied to small warheads - air-dropped bombs and ship/air-launched cruise missiles. These warheads, unlike those for ballistic missiles, can be stored or transported in a functional or semi-functional state and thus may be lost or stolen. For these weapons, the two-man rule utilizes the PALs themselves - two officers must concur with the legitimacy of a nuclear launch order and release their portions of the PAL codes, or else the warheads cannot be armed.▼
* The Soviets had two launch keys and unlock codes held by the higher-ups (i.e. on shore) for their submarines. Now the case for US subs, but not always.▼
* For safety deposit boxes, one key is the bank's and one is the customer's. This ensures that the bank cannot open your box without you, and that you (or someone with your key) can't open your box without showing ID to the bank.▼
** At least, this used to be the case. Banks are adding increasingly more checks to get in. In the case of [http://www.bankofamerica.com/ one large bank], you must enter a PIN, pass a biometric scan, and use a regular old key as well, constituting three-factor authentication.
* Some Soviet nuclear missile silos had three blast doors, each needing three keys, and each key given to a different person. So a total of nine people were needed to actually get access to the missiles.▼
* In a much more mundane context, most of the rides at the local amusement park won't launch without both operators holding the go buttons, and they can still be locked out by ride sensors.▼
* Many industrial machines have two start buttons, but they are close enough to be pressed by a single operator so long as he uses both hands. The goal here is to ensure that both of the operator's hands are on the control box, and not in the machine. Depending on the machine, there might also be a footpedal.▼
* In some poor villages of Africa where they have opted for Food Bank (filled with food aid for use when the harvest is lean and topped up by local farmers when the harvest is good) three people from the community are given keys and required to open it. Because as Josette Sheeran says; [http://www.ted.com/talks/josette_sheeran_ending_hunger_now.html food is gold]▼
 
 
▲== Video Games ==
* ''[[Metroid Prime|Metroid Prime 3: Corruption]]'' has you do this with a GF trooper in order to activate an elevator. {{spoiler|The "trooper" in question is the shape-shifting foe Gandrayda.}}
* Oddly enough, only two "puzzles" in ''[[Resident Evil]] 4'' need Leon and Ashley to do this.
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** Thankfully, unlike many games, the AI is smart enough to move some distance to the other switch, without having to carefully babysit them through each step.
* Opening the shuttle bay door in ''[[Space Quest]] 6'' requires two people (or one person {{spoiler|with another person's arm appendage}}). Interestingly enough, this trope is inverted any and all of the auto-destruct sequences in the series.
* One [https://web.archive.org/web/20100905050249/http://lparchive.org/LetsPlay/Boatmurdered/chapter1-27.html update] of a [[Let's Play]] of the [[Dwarf Fortress]] map BoatMurdered had someone submit a drawing of the employment of the "lava death system." With two keys, natch. In the actual game, of course, the system was activated by a simple lever.
* One bank that [[Splinter Cell|Sam Fisher]] has to infiltrate in ''Chaos Theory'' has a [[Two -Keyed Lock]] protecting its main vault. Fisher, however, has a remote-controlled key-turning device.
* ''[[The Legend of Zelda Four Swords]]''-series has a lot of puzzles which include the "four buttons, each of them only triggers if a person is standing on it"-factor. In some of the games this is subverted by "one player controls four characters". At some places this is required to move on, at others it's just "drop a lot of loot"!
** In fact, there are a lot of these in the Zelda games. Sometimes using a block or the assistance of lovely Princess Zelda (as a Phantom) to push one, or hitting a series of switches with the boomerang. [[The Legend of Zelda: Majora's Mask|Majora's Mask]] has plenty of these in the Stone Tower, and in order to work them you need the Elegy of Emptiness, which creates a statue duplicate of your form, and the Zora and Goron masks.
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* ''[[Skies of Arcadia]]'' has an odd one. A whole dungeon focused around locks that require two people to stand on panels in different parts of the dungeon. The thing is, neither side knew that they were helping each other get past and they just both happened to be searching for the same treasure at the same time.
* ''[[Ratchet and Clank]] Future: A Crack in Time'' 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.
* [[Mortal Kombat: Shaolin Monks]] has a bunch of these. They're completely optional secrets/goodies, and in no way necessary to continue the game. They ARE, however, essential to 100% completion. If you're a completionist, and you don't have a sibling or buddy to play the game with, don't get the game.
* The ''[[Portal (series)|Portal]]'' games use a few of these in both single-player and co-op. The former involve two buttons that need to be pressed within a short timespan of each other, and thus require having your two portal ends right next to them. (One of these is justified as an actual two-keyed security lock. The rest are just part of the tests.) The latter actually involve both players, and the game has thoughtfully included the ability to initiate a countdown that appears on the other's screen.
* ''[[Ōkamiden|Okamiden]]'' being based around partners has a plenty of these throughout the game where Chibi and his partner must stand on pressure pads to unlock doors or make bridges appear. One Notable example has a two-buttoned lock which is also a trap forcing Chibi to play through half the dungeon himself to gain the key to free his friend.
* ''[[City of Heroes]]'' (as well as some other [[MMORPGMassively Multiplayer Online Role Playing Game|MMORPGsMMORPG]]s) have missions where a given number of people must trigger some kind of switch simultaneously (or within a margin of error given lag times) in order to complete.
* The Thieves' Guild vault in [[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.}}
 
== [[Web Comics]] ==▼
 
▲== Web Comics ==
* Used [http://www.goblinscomic.com/d/20090103.html here] in ''[[Goblins]]: Life Through Their Eyes'', with a four-key system. {{spoiler|[[Cutting the Knot|A giant just smashes the door open for them]], because they REALLY don't have time for puzzles.}}
 
== [[Web Original]] ==▼
 
* In ''[[FreemansFreeman's Mind]]'', Gordon accidentally launches what he believes to be a missile (it's actually a satellite delivery rocket, but he hadn't been paying attention to the security guard who told him about it) and afterward mentions that he would have expected one of these instead of just the [[Big Red Button]] he pressed. Even for a satellite delivery rocket, and even considering he was resuming an aborted launch, yeah, you'd think the procedure would be at least a little more complex.▼
▲== Web Original ==
* In ''[[Axe Cop]]'' 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. [https://web.archive.org/web/20120717080046/http://axecop.com/index.php/acepisodes/read/episode_105/ Not that they get very far after that point].▼
▲* In ''[[Freemans Mind]]'', Gordon accidentally launches what he believes to be a missile (it's actually a satellite delivery rocket, but he hadn't been paying attention to the security guard who told him about it) and afterward mentions that he would have expected one of these instead of just the [[Big Red Button]] he pressed. Even for a satellite delivery rocket, and even considering he was resuming an aborted launch, yeah, you'd think the procedure would be at least a little more complex.
▲* In ''[[Axe Cop]]'' 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].
* ''[[Atop the Fourth Wall]]'' uses the exact self-destruct code from Star Trek III in the [[Cold Open]] 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.}}
 
== [[Western Animation]] ==▼
 
▲== Western Animation ==
* One of many many secure location tropes parodied in a ''[[Family Guy]]'' "found a new place to hide my porn" sequence.
* On ''[[The Simpsons]]'' two keys were required to be turned simultaneously to drop the "perfect 300 game" balloon at the bowling alley.
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* The Fire Temple's inner sanctum in ''[[Avatar: The Last Airbender]]'' could only be opened by five simultaneous fireblasts. A single sufficiently skilled Firebender (such as a fully trained Avatar) ''could'' do all five at once, but in most cases it took five people.
* In ''[[Gargoyles]]'', when Halcyon Renard's second, fully-automated airship is sabotaged, he goes to the bridge to take it off a collision course, only to realize that two people are needed at two different consoles to perform emergency course corrections.
 
▲== [[Real Life]] ==
▲*** [[Truth in Television]], this, especially in terms of US ICBM silos. The two key slots are far enough apart that one person can't turn both at the same time. Plus you'll need the launch codes, if they're not [[Broken Arrow (1996 film)|set to 00000000.]] (Yes, that actually happened: see [[wikipedia:Permissive Action Link|Permissive Action Link]]. Under the [[John F. Kennedy|Kennedy administration]], somebody decided to put PALs on the US nuclear arsenal to prevent unauthorized firing. SAC objected to this practice, fearing the possibility that the launch codes would not be available in time of need. So, SAC very quietly, SAC installed these devices, intended to ensure the safety of the free world, and very quietly, they set the combination on every single one of them to [[Spaceballs|00000000]]. Very trusting people, SAC, although [[Vindicated by History|their trust appears to have been well-placed.]])
▲*** The logic was that warheads mounted to missiles in either ground-based stations or in ballistic submarines are secure because of the two-man-rule interlocks, and PALs would risk a loss of readiness without significant security benefit. Actual (non-trivially-coded) PALs were (eventually) applied to small warheads - air-dropped bombs and ship/air-launched cruise missiles. These warheads, unlike those forUnlike ballistic missiles, these warheads can be stored or transported in a functional or semi-functional state, and thus maycan be used if lost or stolen. For these weapons, the two-man rule utilizesuses the PALs themselves - two officers must concur with the legitimacy of a nuclear launch order and release their portions of the PAL codes, or else the warheads cannot be armed.
▲* The Soviets had two launch keys and unlock codes held by the higher-ups (i.e. on shore) for their submarines. Now the case for US subs, but not always.
▲* For safety deposit boxes, one key is the bank's and one is held by the customer's. This ensures that the bank cannot open your box without you, and that you (or someone with your key) can't open your box without showing ID to the bank. (Banks are adding increasingly more checks to get in. In the case of [https://web.archive.org/web/20090620014808/http://www.bankofamerica.com/privacy/sitekey/ one large bank], you must enter a PIN, pass a biometric scan, and use a regular old key as well, constituting three-factor authentication.)
▲* Some Soviet nuclear missile silos had three blast doors, each needing three keys, and each key given to a different person. So a total of nine people were needed to actually get access to the missiles.
▲* In a much more mundane context, most of the rides at the local amusement park won't launch without both operators holding the go buttons, and they can still be locked out by ride sensors.
▲* Many industrial machines have two start buttons, but they are close enough to be pressed by a single operator so long as he uses both hands. The goal here is to ensure that both of the operator's hands are on the control box, and not in the machine. Depending on the machine, there might also be a footpedalfoot pedal.
▲* In some poor villages of Africa where they have opted for Food Bank (filled with food aid for use when the harvest is lean and topped up by local farmers when the harvest is good) three people from the community are given keys and required to open it. Because asAs Josette Sheeran says;, [https://web.archive.org/web/20131019104825/http://www.ted.com/talks/josette_sheeran_ending_hunger_now.html food is gold].
* As detailed on ''[[60 Minutes]]'', the [https://en.wikipedia.org/wiki/Monastic_Republic_of_Mount_Athos Mount Athos monastery] has a vault which contains the order's most valuable books, documents, and artifacts, the door to the vault requiring several different keys to open, and a rule in place that says a monk is not allowed to hold more than one key at one time. Mike Wallace even described it as an archaic version of the PALs system listed above.
 
{{reflist}}
[[Category:Stock Video Game Puzzle]]
[[Category:Military and Warfare Tropes]]
[[Category:Two Keyed Lock{{PAGENAME}}]]
Retrieved from "https://allthetropes.org/wiki/Special:MobileDiff/1058350...1974634"