Via disinformation:
Cabinet Magazine has a fascinating and mysterious article on William F. Friedman, perhaps the greatest code-breaker in modern history, who became a hero of World War II by breaking Japan’s PURPLE code and inventing the Army’s best cipher machine. His achievements stemmed from the ‘biliteral cipher’, a simple but powerful encoding technique developed in the sixteenth century, which allows for hidden messages to be conveyed by anything from flower petals to musical notes to faces in a photograph.
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