Mystery of The Great Cipher
Louis XIV of France, also known as the Sun King, is one of the most important figures in European history. An encrypted letter he wrote using the Great Cipher in 1693 has never been deciphered. For nearly 250 years, the Great Cipher remained unbreakable, and even today, much of its ciphertext is still undeciphered. The father-and-son duo Antoine and Bonaventure Rossignol created the Great
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