Emperor king’s top secret assassination letter finally decrypted after 500

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This letter, written by Charles V in 1547, contains long sections of mysterious symbols used to encrypt top secret information. (Image credit: Stanislas Library) (opens in new tab)

Researchers have finally cracked a complex code used in a top secret letter from 1547 that the Holy Roman Emperor and King of Spain, Charles V, wrote when he was fearing for his life. In the encrypted letter, which was sent to one of his ambassadors in France, Charles V writes about tensions with the French king Francis I, who he thought might be plotting to assassinate him. 

Charles V, the King of Spain between 1516 and 1556, also ruled the Holy Roman Empire from 1519 to 1556. During his rule, Charles V presided over one of the largest empires in European history, which covered modern day Spain, Germany, Austria, Belgium, Netherlands and parts of Italy, and he also oversaw the Spanish colonization of the Americas. 

In 1547, Charles V wrote a letter to his French ambassador Jean de Saint-Mauris. The document, which is dated Feb. 22, contains several paragraphs in normal handwriting interspersed by large sections of unrecognizable symbols — a secret code intended to hide sensitive information. The letter is now part of the archives at the Stanislas Library in Nancy, a city in eastern France, where it has remained untouched for centuries. 

The letter, rediscovered by library staff in 2019, later came to the attention of a team of cryptographers and computer scientists who took it upon themselves to uncover the coded section of the document. Now, after more than six months of “painstaking” research, the code has been cracked, the team announced Nov. 23 at a press conference at the Stanislas Library (opens in new tab). 

“It’s rare as a historian to manage to read a letter that no one had managed to read for five centuries,” project researcher Camille Desenclos (opens in new tab), a historian at the University of Picardy Jules Verne in France, said at the press conference.

Related: Secret words exchanged between Marie Antoinette and rumored lover uncovered in redacted letters

The code used by Charles V was hard to decipher for two main reasons, according to a statement (opens in new tab) translated from French. 

First, each symbol represented a whole word, rather than being a simple letter-for-letter encryption, which would have been much easier to work out. Second, some of the symbols were decoys that meant absolutely nothing, which were likely added to throw off anyone who had knowledge of the code and tried to read the letter.

The researchers began the investigation with a simple computer program designed to help them differentiate the symbols and understand the structure of the writing. However, this proved fruitless and the team was forced to create a more advanced algorithm that could use patterns in the symbols to determine probable meanings and highlight probable decoy symbols. The new algorithm helped uncover some of the hidden passage but could not decipher the entire section, the researchers wrote in the statement. But luckily, the team was able to find part of a decryption code in a separate letter written by Jean de Saint-Mauris to another ambassador serving Charles V, which helped to fill in the gaps.

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