Category Archives: The Great Cipher

Why the Great Cipher was remained unbroken for 200 years?

The first reason of the Great Cipher used was remained unbroken for 200 years is that the creative idea of replacing syllabus by different numbers. With the development of the cryptography, more and more encrypting methods are invented. This limits the thoughts of people to use previous methods to solve this new encrypted method. Also, […] Continue reading

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The Cipher That Survived for 200 Years

The Great Cipher of King Louis XIV was an enhanced monoalphabetic substitution cipher that managed to remain unsolved for over two centuries.  It was developed by the father-and-son team of Antoine and Bonaventure Rossignol, two of the best cryptanalysts in France.  King Louis XIV used it to securely encrypt sensitive information regarding his political plans.  […] Continue reading

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Why The Great Cipher Remained Great

The Great Cipher used by Louis XIV encoded syllables and single letters using 587 different numbers and remained unbroken for 200 years. One factor contributing to the strength of this cipher could be that during the time period in which the cipher was in use, the most well known ciphers included the monoalphabetic substitution cipher, […] Continue reading

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The Greatest Cipher

Louis XIV’s Great Cipher was unique in its complexity, far far beyond the other ciphers used during the time period. Indeed at the time, by far the most popular type of cipher was the mono alphabetic substitution cipher, yet that is easily deciphered by a good cryptanalyst through the use of frequency analysis.  The Great […] Continue reading

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200 Years of Strength

The first thing The Great Cipher used by Louis XIV did well was not being a monoalphabetic cipher. These ciphers are too susceptible to frequency analysis, making them crackable in a matter of hours at the most. Instead, the Great Cipher is more along the lines of a polyalphabetic cipher. Instead of letters, however, the […] Continue reading

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The Greatness of the Great Cipher

I see The Great Cipher is synonymous to the simple monoalphabetic substitution cipher, just on steroids. The concept is the same—one cipher letter or multiple cipher numbers represent a number of plaintext letters. However, what makes the two so different in their difficulty to be cracked lies in the sheer possibility of combinations that could be created from […] 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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Power of The Great Cipher

There exists a never ending battle in the field of cryptography between those coming up with encryption methods and encrypting messages to those trying to break these ciphers. This back and forth is an ongoing and fairly quick process with … Continue reading Continue reading

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Unbreakable 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 Great Cipher, invented by Antoine and Bonaventure Rossignol, was one of the toughest codes to decipher. … 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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