Ciphers

Bifid in the factory

Hard. Bifid cipher. Keyword TESLA, period 5, I/J share.

CipherCipherSunday 30 August 2026

Cipher · Sunday 30 August 2026

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Build a 5×5 from TESLA, then the rest of the alphabet minus J. For each five-letter block, write row numbers, then column numbers, then read pairs as new letters.

FPNTNAED

Eight letters, two words once you put the space back. The paper’s weather.

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Bifid in the factory — The Gold Standard