08/05/2022

Re-discovery of Philip II's Cipher with Secretary Escovedo in Antwerp (1577)

I reconstructed a cipher used in a letter from secretary Escovedo to Philip II dated Antwerp, 9 April 1577 (see here). Since the ciphertext is accompanied with an extract of the decipherment, there was little difficulty in the reconstruction. It is the same as the cipher solved by St. Aldegonde, printed in David Kahn's The Codebreakers, p.120. 



 

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