Category Archives: Louis XIV

The Great Cipher:Cryptography as Man in the Iron Mask:French Lore

The Great Cipher of Louis XIV proved to be one of the most challenging ciphers ever recorded. This was brought together by the father son duo of Antoine and Bonaventure Rossignol. They immersed themselves in studying and perfecting methods of cryptography from the past and eventually determined how to create a form of encryption stronger […] Continue reading

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The Great Cipher: An Unbreakable Cipher for 2 Centuries

The father-and-son team of Antoine and Bonaventure Rossignol invented the Great Cipher for the French king Louis XIV to encrypt the empire’s most secret messages, protecting details of his plans, plots and political schemings. While the nature of the Great Cipher was simply an enhanced monoalphabetic cipher with homophones, it seemed implausible that it remained […] Continue reading

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Cryptography » Student Posts 2015-09-16 21:58:04

In response to the reading question: “The Great Cipher used by Louis XIV remained unbroken for 200 years.  What were the factors that led to such a secure cipher?” CONNA described how the death of the father and son duo led to the collapse of breaking the code due to the fact that there was […] Continue reading

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Historical Astronomers in Context: Isaac Newton

(Image from Wikipedia) Isaac Newton (December 25, 1642 – March 20, 1727) was a born a poor Englishman who attended Trinity College in Cambridge in order to try and improve his socioeconomic standing. He gained an interest in the world around him after witnessing an apple drop from a tree to the ground. At that […] Continue reading Continue reading

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Be vague and Roman Numerals

After the execution of Mary Queen of Scots but prior to the development of more complex ciphers, like the Vigenère cipher, “anybody sending an encrypted message had to accept that an expert enemy codebreaker might intercept and decipher their most precious … Continue reading Continue reading

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Phonetic Way of Mind

The Great Cipher used by Louis XIV remained unbroken for 200 years.  What were the factors that led to such a secure cipher? The cipher was pioneered by a father and son duo, most of the specifics to how it … Continue reading Continue reading

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Not Your Average Monoalphabetic Cipher

The Great Cipher used by Louis XIV remained unbroken for 200 years.  What were the factors that led to such a secure cipher? The father-son team of Antoine and Bonaventure Rossignol invented The Great Cipher while working closely with Louis … Continue reading Continue reading

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The Great Cipher: 200 Years of Security

Louis XIV used the Great Cipher, invented by Antoine and Bonaventure Rossignol, throughout the seventeenth century. Following the death of the Rossignols, The Great Cipher remained an unsolved mystery until the nineteenth century, when new texts encrypted by The Great … Continue reading Continue reading

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Bazeries’ Quest Against The Great Cipher

The Great Cipher used by Louis XIV implemented a different method of cryptography and ciphering than ever before. The monoalphabetic substitution cipher was too easy to break while the polyalphabetic cipher created by Vigenère took too long to encipher and … Continue reading Continue reading

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Syllable Substitution

The Great Cipher of Louis XIV was truly a remarkable cipher, and its longevity only attests to its success. Antoine and Bonaventure Rossignol were the masterminds behind its brilliance, and with their death brought the end of its effective use. … Continue reading Continue reading

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