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Lewis Carroll's Table

A square of 26 alphabets. The key word picks a different one for every letter, which is why it held for centuries.

Rail Fence

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Result —

How it works

The story

Crack these

← Polybius Squares All the ciphers Playfair →

Take it off the screen

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.

Print this page as a worksheet Try the challenges

Read more elsewhere

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

Vigenere cipher