Cabinet Noir
>Cryptoanalysis / Rail fence
Not sure which cipher? Identify it
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learning.railFence.description
Type
transposition cipher
Breaking it
trivial to break
Era
American Civil War
Name
Fence-line ciphers; the scytale as the ancient forerunner
Modes
encrypt · decrypt · cryptoanalysis
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Tool
Cryptoanalysis
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History
Practice
Not the right cipher? Identify it
Ciphertext to break
Hints
Easy
Medium
Hard
Custom
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Best-setting mark
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1. Try the rail counts
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2. Done
Slide the rail count (and the offset) — the fence re-draws and the plaintext candidate updates. When the rows read like English, you have it; the meter only measures how English-like each setting looks.
Rails: 3
Offset: 0
English-likeness
0
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Created by Denys Grybov in 2021
v.0.4.0 // released on 20.10.2026