I uploaded a new article "Simulated Paper-and-Pencil Codebreaking of a Ciphered Letter of Mary, Queen of Scots", which demonstrates how paper-and-pencil codebreakers could have broken a cipher used in a letter from Mary, Queen of Scots, to James Beaton, Archbishop of Glasgow (1586).
Remember that I did not break this cipher myself. The article only "simulates" how it could have been achieved by codebreakers such as Thomas Phelippes without using computer tools.
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