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Rail Fence (ZigZag) Cipher

Tools to decrypt/encrypt Rail Fence automatically. Rail Fence cipher is a transposition cipher consisting in writing a text in zig-zag and read it from left to right.

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Rail Fence (ZigZag) Cipher -

Tag(s) : Cryptography, Transposition Cipher

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Rail Fence (ZigZag) Cipher

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Rail Fence Decoder







Rail-Fence Encoder






Tools to decrypt/encrypt Rail Fence automatically. Rail Fence cipher is a transposition cipher consisting in writing a text in zig-zag and read it from left to right.

Answers to Questions

How to encrypt using Rail Fence cipher?

Rail Fence Encryption uses an integer for the number of levels of the zigzag

Example: Encrypt DCODEZIGZAG with N=3.

The message is written in zig zag and read in lines.

Example:

D---E---Z--
-C-D-Z-G-A-
--O---I---G

Example: The ciphered message is DEZCDZGAOIG.

How to decrypt Rail Fence cipher?

Rail Fence decryption requires to know the number of levels N.

Example: Decrypt the message DEZCDZGAOIG with N=3

Write the expected zigzag form and complete it by lines, before reading as zig zag

Example:

X---X---X--
-X-X-X-X-X-
--X---X---X
then
D---E---Z--
-C-D-Z-G-A-
--O---I---G

Example: The original plain text is DCODEZIGZAG.

How to recognize Rail Fence ciphertext?

A message encoded by Rail-Fence has an index of coincidence equal to that of the language of the original text.

Frequency analysis reveals usual occurrences of common letters similar to a plain text.

How to decipher Rail Fence without the number of levels?

One can crack Rail Fence by testing all levels from 2 to N. Use the Brute-force attack button.

What are the variants of the Rail Fence cipher?

There are several variations:

- The fence may begin with a peak or a hollow (up or down).

Example: A...E
.B.D.
..C..
(↘↗ hollow)

Example: ..C..
.B.D.
A...E
(↗↘ peak)

- The first letter is not necessarily the base of the peak or hollow, the zig zag can start in the middle (equivalent to add spaces at the beginning)

Example: ....D.
.A.C.E
..B...
(One shift)

- It is possible to allow the spaces and punctuation, which shifts the characters.

What is the difference between Rail Fence and ZigZag?

None, Rail Fence is the original word, ZigZag is the mnemonic term.

When Rail-Fence have been invented?

No date is recognized.

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Source code

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Questions / Comments


Team dCode read all messages and answer them if you leave an email (not published). It is thanks to you that dCode has the best Rail Fence (ZigZag) Cipher tool. Thank you.


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