History Main / TheBookCipher

1st May '17 10:10:25 AM jamespolk
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* ''Literature/TheSympathizer'': The narrator, a Vietnamese Communist spy reporting back to Hanoi about the activities of anti-Communist Vietnamese in America, uses such a cipher, which he combines with using invisible ink.
24th Apr '17 7:54:57 AM isolato
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22nd Apr '17 6:05:11 AM Antigone3
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\n[[/folder]]\n* ''[[Literature/{{Safehold}} By Heresies Distressed]]'': A group of Temple Loyalists uses a four-number book cipher (page, paragraph on that page, sentence in that paragraph, word in that sentence) to plot Sharleyan's assassination. While the cipher itself was devised by the Church centuries earlier, one plotter notes the irony that Charis' "heretical" introduction of Arabic numerals [[note]]pre-Merlin Safehold used Roman numerals[[/note]] makes the cipher much easier to use.

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29th Mar '17 5:55:49 AM jamespolk
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* GrahamGreene's heroes often use book codes. In ''The Human Factor'', several books are used, and an edition of Charles Lamb's ''Tales from Shakespeare'' is used in ''Our Man in Havana''.

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* GrahamGreene's Creator/GrahamGreene's heroes often use book codes. In ''The Human Factor'', several books are used, and an edition of Charles Lamb's ''Tales from Shakespeare'' is used in ''Our Man in Havana''.



* The German spy uses this kind of encryption in ''[[Literature/ErastFandorin The Death of Achilles]]''.

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* The German spy uses this kind of encryption in ''[[Literature/ErastFandorin The Death of Achilles]]''.''Literature/TheDeathOfAchilles''.
8th Mar '17 9:48:29 AM nombretomado
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* The heroes of the MatthewReilly novel ''Six Sacred Stones'' used a book cipher to send confidential messages to each other. The key text was [[spoiler:the Harry Potter books]], but the messages were sent via [[spoiler:a Lord of the Rings forum to make the key text harder to identify]].

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* The heroes of the MatthewReilly Creator/MatthewReilly novel ''Six Sacred Stones'' used a book cipher to send confidential messages to each other. The key text was [[spoiler:the Harry Potter books]], but the messages were sent via [[spoiler:a Lord of the Rings forum to make the key text harder to identify]].
11th Jan '17 7:34:24 PM nombretomado
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* In ''A Presumption of Death'', LordPeterWimsey, on assignment for British Intelligence in WWII Nazi-occupied Europe, uses a code based on the works of Creator/JohnDonne. The Germans, suspecting that an intelligence service in which Oxonians have a major role would choose a classical work of English literature, systematically try such works until hitting the right one and breaking the code, coming near to catching the spy. Wimsey then improvises a new code, based on an unpublished text known only to himself and his wife.

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* In ''A Presumption of Death'', LordPeterWimsey, Literature/LordPeterWimsey, on assignment for British Intelligence in WWII Nazi-occupied Europe, uses a code based on the works of Creator/JohnDonne. The Germans, suspecting that an intelligence service in which Oxonians have a major role would choose a classical work of English literature, systematically try such works until hitting the right one and breaking the code, coming near to catching the spy. Wimsey then improvises a new code, based on an unpublished text known only to himself and his wife.
27th Nov '16 5:57:34 PM nombretomado
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Big and well-known books make better sources as you have more words to choose from (thus Literature/TheBible is often the source), and no one will react if you're walking around with a pocket version of ''TheDaVinciCode''. Relatedly, if you are unfortunate enough to lose your copy, a well-known book will be easier to replace without raising eyebrows. If you're walking around with an 1824 edition of a book, or asking specifically to buy a copy of the fourth printing of the second edition of something... people may well get suspicious (especially the detective who's after you). Of course, using a widely available book also makes it easier for other people to read your messages, should they be intercepted, and while the book itself may be utterly innocuous, sending a letter that is merely a long list of numbers is an unmistakeable indication that you are communicating in code.

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Big and well-known books make better sources as you have more words to choose from (thus Literature/TheBible is often the source), and no one will react if you're walking around with a pocket version of ''TheDaVinciCode''.''Literature/TheDaVinciCode''. Relatedly, if you are unfortunate enough to lose your copy, a well-known book will be easier to replace without raising eyebrows. If you're walking around with an 1824 edition of a book, or asking specifically to buy a copy of the fourth printing of the second edition of something... people may well get suspicious (especially the detective who's after you). Of course, using a widely available book also makes it easier for other people to read your messages, should they be intercepted, and while the book itself may be utterly innocuous, sending a letter that is merely a long list of numbers is an unmistakeable indication that you are communicating in code.
12th Oct '16 4:12:26 AM Morgenthaler
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* A book cipher plays an important role in the TV version of ''{{Sharpe}}'s Sword''. The key text is [[spoiler:Voltaire's ''{{Candide}}'']].

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* A book cipher plays an important role in the TV version of ''{{Sharpe}}'s ''Series/{{Sharpe}}'s Sword''. The key text is [[spoiler:Voltaire's ''{{Candide}}'']].''Literature/{{Candide}}'']].
1st Oct '16 11:47:36 AM jamespolk
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* ''Series/SeventeenMomentsOfSpring'': Stirlitz, a Soviet DeepCoverAgent in Nazi Germany in the closing months of World War II, uses one of these to decode messages sent from Moscow.
24th Sep '16 8:32:10 AM Morgenthaler
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* Used in ''[[Literature/TheGoodSoldierSvejk The Adventures of Good Soldier Svejk in the World War I]]'' when the officers are briefed on the newest cipher method, which apparently is a variant of the book cipher based upon the pages 160 and 161 of a German novel "''Die Sünden der Väter''". However, the book used is a novel in two volumes and [[TheFool the protagonist]], when ordered to deliver them to the battalion officers, was not informed that it was the second part which was needed and delivered the first tomes only, keeping the second volumes in storage, believing that 'they gentlemen officers would surely like to read the novel in the proper order, as anyone else, and after they had read the first part they'd be issued with the second part'. {{Hilarity ensued}} during the briefing, when only ([[HighHopesZeroTalent overly ambitious yet generally incompetent]]) officer-cadet Biegler was [[TooDumbToFool brave enough to point out]] that the example given does not make any sense, while other officers just kept calm and quietly assumed that their regimental colonel finally went completely bananas and would be soon [[KickedUpstairs promoted to the war ministry]].

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* Used in ''[[Literature/TheGoodSoldierSvejk The Adventures of Good Soldier Svejk in the World War I]]'' when the officers are briefed on the newest cipher method, which apparently is a variant of the book cipher based upon the pages 160 and 161 of a German novel "''Die Sünden der Väter''". However, the book used is a novel in two volumes and [[TheFool the protagonist]], when ordered to deliver them to the battalion officers, was not informed that it was the second part which was needed and delivered the first tomes only, keeping the second volumes in storage, believing that 'they gentlemen officers would surely like to read the novel in the proper order, as anyone else, and after they had read the first part they'd be issued with the second part'. {{Hilarity ensued}} during the briefing, when only ([[HighHopesZeroTalent overly ambitious yet generally incompetent]]) officer-cadet Biegler was [[TooDumbToFool brave enough to point out]] that the example given does not make any sense, while other officers just kept calm and quietly assumed that their regimental colonel finally went completely bananas and would be soon [[KickedUpstairs promoted to the war ministry]].



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