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Chatter: Cryptography in History and in the Movies with Vince Houghton

The Lawfare Podcast

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The Value of Invisible Ink

There is an invisible ink display as well as a workshop for people to write messages decode them using invisible ink. One of the oldest still classified secrets in the United States until our working lifetime was some invisible ink recipe from the First World War. The story of Josephine Baker is a great one here where on her sheet music as she moved around occupied France in between the lines she wrote messages from the resistance to the resistance and invisible ink.

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