ADFGVX cipher

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Notion

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Science and technology

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What Wikipedia says

In cryptography, the ADFGVX cipher was a manually applied field cipher used by the Imperial German Army during World War I. It was used to transmit messages secretly using wireless telegraphy.

Excerpt from the Wikipedia article “ADFGVX cipher”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Unknown author, Public domain, via Wikimedia Commons.