![](https://scienceblogs.de/klausis-krypto-kolumne/files/2021/02/Cipherbrain-Visual.png)
Crypto history expert Frode Weierud has provided me a number of unsolved German cipher messages from the Second World War. Can a reader break them?
In the Second World War, the Germans used a manual cipher, the “double box”. Here’s a double-box cryptogram for my readers to solve.
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