Code Breaking Mary Queen of Scots Lost Cipher Letters

That Shakespeare Life

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In As You Like It, Orlando says “Which I take to be either a fool or a cipher.” that’s one of a dozen references to ciphers in Shakespeare’s plays, which reflects the place of ciphers as a common way to keep secrets, particularly among the elite, for Shakespeare’s lifetime. One of the most famous ciphers for Shakespeare’s lifetime was written between 1578 and 1584, while Shakespeare was just getting his career started in London as a playwright, when they were written by none other than Mary, Queen of Scots. For 19 years prior to her execution, Mary Queen of Scots was imprisoned in England, and during that time, she wrote extensively, including letters in code. It was known that between 1578 and 1584, just 3 years before her death, Mary wrote a series of letters in code to the French ambassador, but those letters were considered to have been lost. Surprisingly, the letters survived, but because they consist of unreadable encoded text, no one knew what they were about, and they were stored away in unrelated collections in the National Library of France, where they went unexplored, until 400 years later. In 2023, an international team of codebreakers happened to stumble upon the documents when they were looking for historical ciphers in order to crack them. They not only found Mary’s lost letters, but managed to decode them, and present the contents to the world for the first time in almost half a millennia. Lead author and Israeli computer scientist, George Lasry, is here today to tell us about the team’s efforts, the decoding process, what Mary wrote, and why it was so important for the letters to be in cipher in the first place.

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