Breaking a 16th-Century Holy Roman Emperor's Cipher
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Tradecraft and Trickery in the Aegean World
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Musical codes, now and then. Is a catchy tune the best way to send a secret message? 
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The assassination of Georgi Markov in London in 1978. Who killed the Bulgarian dissident, why, and how? A mystery solved.
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This is Secret Worlds, a newsletter about Historical Espionage.
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