![](https://scienceblogs.de/klausis-krypto-kolumne/files/2021/02/Cipherbrain-Visual.png)
Some of the crypto mysteries I recently introduced on this blog were quite tough. As a change, here are a few easier ones from a 19th century children’s magazine.
Some of the crypto mysteries I recently introduced on this blog were quite tough. As a change, here are a few easier ones from a 19th century children’s magazine.
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