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* In [[Script/NumberTwo the original script]] (''not'' the final script) of ''Film/BackToTheFuturePartII'', Marty gets lost and arrested in the 1960s. Without any ID he can give the authorities that wouldn't reveal him as a time traveler, he gives his name as "Marty [=DeLorean=]" and tells his lawyer to publish his story in the newspapers, in the hopes of Doc Brown discovering the newspaper and bailing him out. It doesn't quite go as planned, though: while Doc does see and recognize the message, Lorraine (a hippie in this time period) gets to him first and bails him out, believing him to be a kindred spirit (apparently not noticing that he looks identical to her one-time boyfriend "[[ImMrFuturePopCultureReference Calvin Klein]]").
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* ''Film/InsideTheLines'': Jane, who is a German spy, receives a letter that appears to be idle chatter from her friend in Paris. When she puts a special stencil with holes cut out over the letter, the stencil reveals the real message, which is that she is to go to Paris and report to the German spymaster immediately.
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* ''Series/{{Castle}}'': In the episode "Murder Most Fowl", When the abducted Tyler sends a video message to his father Dean, he says, "Don't forget to feed Ace"; since the family doesn't have a pet, the team realizes that this was actually a way to tell them that he's being kept in the subway tunnels at a point where the A, C and E lines intersect.
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* In the Literature/JourneyToTheCenterOfTheEarth film sequel, ''Journey 2: The Mysterious Island'', Sean receives a radio signal with each word being characters of Jules Verne. With his stepfather's help to discover to be a Morse Code that the [[ATrueStoryInMyUniverse island is real]] and able to get the coordinates by combining the maps from Literature/TreasureIsland, Literature/GulliversTravels, and Literature/TheMysteriousIsland.
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* In the Literature/JourneyToTheCenterOfTheEarth ''Film/JourneyToTheCenterOfTheEarth2008'' film sequel, ''Journey 2: The Mysterious Island'', ''Film/Journey2TheMysteriousIsland'', Sean receives a radio signal with each word being characters of Jules Verne. With his stepfather's help to discover to be a Morse Code that the [[ATrueStoryInMyUniverse island is real]] and able to get the coordinates by combining the maps from Literature/TreasureIsland, Literature/GulliversTravels, and Literature/TheMysteriousIsland.
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* In ''ComicBook/StrangersAtTheHeartsCore'', a criminal group called the Visitors coerce Fred Danvers into sending ComicBook/{{Supergirl}} a holographic message to dissuade her from searching for their headquarters. As listening to her father's projection warning that her mother is being held hostage, Supergirl notices how peculiarly and insistently he is stressing "[She] cannot go past [him]" because "It's a stone wall before [her]!". Given that there are no walls around her -because she happens to be flying over the Catskill Mountains-, Supergirl realizes he is surreptitiously saying he can teleport her into the Visitors' lair if she flies into his hologram.
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* In ''ComicBook/StrangersAtTheHeartsCore'', a ''ComicBook/StrangersAtTheHeartsCore'': A criminal group called the Visitors coerce Fred Danvers into sending ComicBook/{{Supergirl}} a holographic message to dissuade her from searching for their headquarters. As listening to her father's projection warning that her mother is being held hostage, Supergirl notices how peculiarly and insistently he is stressing "[She] cannot go past [him]" because "It's a stone wall before [her]!". Given that there are no walls around her -because she happens to be flying over the Catskill Mountains-, Supergirl realizes he is surreptitiously saying he can teleport her into the Visitors' lair if she flies into his hologram.
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* In the Literature/JourneyToTheCenterOfTheEarth film sequel, ''Journey 2: The Mysterious Island'', Sean receives a radio signal with each word being characters of Jules Verne. With his stepfather's help to discover to be a Morse Code that the [[TrueStoryInMyUniverse island is real]] and able to get the coordinates by combining the maps from Literature/TreasureIsland, Literature/GulliversTravels, and Literature/TheMysteriousIsland.
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* In the Literature/JourneyToTheCenterOfTheEarth film sequel, ''Journey 2: The Mysterious Island'', Sean receives a radio signal with each word being characters of Jules Verne. With his stepfather's help to discover to be a Morse Code that the [[TrueStoryInMyUniverse [[ATrueStoryInMyUniverse island is real]] and able to get the coordinates by combining the maps from Literature/TreasureIsland, Literature/GulliversTravels, and Literature/TheMysteriousIsland.
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** Winter tells Han about Ackbar's 'kids' acting up, and he inquires about the 'neighbors' -- the New Republic [[HangingSeperately politicians]] and the Empire, respectively. Problem is, this wasn't a code that they'd worked out beforehand -- actually, they never worked it out at all. Winter came up with it on the fly because she knew they'd be listened in on, and just hoped Han would be able to work out enough of it to be useful. Han knows Winter means there's been some problems, but not just what they mean. This incident was, bizarrely, a case of RealLifeWritesThePlot. Long before the book was released Creator/TimothyZahn told some trusted friends about it and met them at a convention to discuss it further, only to realize that they were surrounded by scifi geeks who would know what he meant if he started talking about Luke and Leia and Han and Chewie, and then he'd be in trouble. So on the fly he called them Brother, Sister, Friend, and Copilot... and it worked.
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** Winter tells Han about Ackbar's 'kids' acting up, and he inquires about the 'neighbors' -- the New Republic [[HangingSeperately [[HangingSeparately politicians]] and the Empire, respectively. Problem is, this wasn't a code that they'd worked out beforehand -- actually, they never worked it out at all. Winter came up with it on the fly because she knew they'd be listened in on, and just hoped Han would be able to work out enough of it to be useful. Han knows Winter means there's been some problems, but not just what they mean. This incident was, bizarrely, a case of RealLifeWritesThePlot. Long before the book was released Creator/TimothyZahn told some trusted friends about it and met them at a convention to discuss it further, only to realize that they were surrounded by scifi geeks who would know what he meant if he started talking about Luke and Leia and Han and Chewie, and then he'd be in trouble. So on the fly he called them Brother, Sister, Friend, and Copilot... and it worked.worked.
* In the first trilogy of the ''Literature/HeraldsOfValdemar'' series, Heralds carry arrows which can be marked discreetly and either fired or sent to carry a message to other Heralds. A headless arrow means the Herald is dead; a broken arrow means 'complete disaster, situation hopeless, do not attempt rescue.'
* In the first trilogy of the ''Literature/HeraldsOfValdemar'' series, Heralds carry arrows which can be marked discreetly and either fired or sent to carry a message to other Heralds. A headless arrow means the Herald is dead; a broken arrow means 'complete disaster, situation hopeless, do not attempt rescue.'
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* ''Literature/DeathHasThreeLives'': SexySecretary Lucy Hamilton has been kidnapped, and the kidnapper forces her to write a ransom note to her boss, HardboiledDetective Michael Shayne. Shayne notes the odd phrasing and some strange statements in the note and figures out that there must be a code somewhere but can't decipher it. Finally he figures it out: in a sort of reverse acrostic, the last letters of each line spell out the location where Lucy is being held captive.
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* In ''A Running Duck'' (aka ''Fair Game'') by Paula Gosling, the protagonists open a newspaper and are shocked to find an open death threat against them. The antagonist got the newspaper to print it by claiming it was an advertising gimmick that would be followed up in the next edition.
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* ''Fanfic/SpotsOff'' sees Adrien held hostage by Hawkmoth in a ransom video for Marinette, whose identity as Ladybug has been made public. Adrien mentions he was captured wearing his jeans, signalling to Marinette that, unlike herself, Hawkmoth does '''''not''''' know that he's Chat Noir.
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* In the ''Series/{{Porridge}}'' episode "Heartbreak Hotel", Macklay explains that this is one of the reasons the radio never reads out requests from prisoners:
--> '''Fletcher''': Oh yeah, that is a point, innit? Some heart-warming Christmas message from an old lag to his wife and family, "Can we have Creator/HarrySecombe singing 'The Impossible Dream'?" He ''really'' means "Be outside E-wing on Boxing Day with a ladder and a mince pie."
--> '''Fletcher''': Oh yeah, that is a point, innit? Some heart-warming Christmas message from an old lag to his wife and family, "Can we have Creator/HarrySecombe singing 'The Impossible Dream'?" He ''really'' means "Be outside E-wing on Boxing Day with a ladder and a mince pie."
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Public key crypto has some significant downsides comparaed to symmetric key crypto.
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* One of the features of [[{{UsefulNotes/Encryption}} "public key encryption"]] is that you can publish one key, letting anyone send you a message that no one without the other key can decipher. Or conversely, you can encrypt with the ''private'' key so that everyone can read your messages knowing they could only have come from you. And you can do both at the same time.
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* One of the features of [[{{UsefulNotes/Encryption}} "public key encryption"]] cryptography"]] is that you can publish one a public key, letting anyone send you a message that no one without the other key can should be able to decipher. Or conversely, you can encrypt with the ''private'' key so that everyone can read your messages knowing they could only have come from you. And you can do both at the same time.time, but you should do that with different key pairs with one being an encryption key pair and another key pair being a signing pair. However, public key cryptography has some downsides. Since publishing a public key does provide a clue about the private key, keys in public key cryptography must be made longer to make the clue about the private key unusable. Second is that public key cryptography is much slower than traditional symmetric key cryptography where all authorized parties and no others share a secret key. Therefore, public key cryptography is used to either compute or encrypt a secret key so that future transmissions can use the much faster secret key.
