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ADFGX

A square and a transposition stacked together, with five letters chosen because they sound nothing alike in morse.

Rail Fence

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The story

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Print this page and you get a worksheet: how the cipher works, where it came from, and the puzzles to crack, with the machine and the menus left off.

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Read more elsewhere

Longer, harder and written for grown-ups. Worth a look when this page runs out.

ADFGVX cipher