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Redefence Cipher

Tools to decrypt/encrypt with Redefence automatically. Redefence cipher is a variant of Rail Fence with a key that defines the order of lines to be read after zig-zag writing.

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Redefence Cipher -

Tag(s) : Transposition Cipher

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Redefence Cipher

Redefence Decoder

 




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Redefence Encoder

 


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Answers to Questions (FAQ)

How to encrypt using Redefence cipher?

The Redefence cipher is similar to the Rail-Fence transposition cipher except that it uses a key that defines both the number of levels in the zig zag and the order in which the lines are read.

Example: The plain message is DCODEZIGZAG and the key ZIG (of size N=3 letters).

The message is encrypted by Redefence (as with Rail Fence) by writing it in zig-zag on N levels.

Example: (1-Z): D---E---Z--
(2-I): -C-D-Z-G-A-
(3-G): --O---I---G

The characteristic of Redefence is to have a key that defines the reading order of the lines.

Example: The letters of the key ZIG are then arranged in alphabetical order G,I,Z which defines the reading order of the lines 3,2,1.

Example: The encrypted message is therefore composed of line 3 OIG, line 2 CDZGA and line 1 DEZ so the final message is OIGCDZGADEZ

How to decrypt a Redefence cipher?

Redefence decryption requires knowing the encryption key because it conditions the number of levels N and the order of reading.

Example: The encrypted message is DNRFEEEEC and the key ZAG (2,3,1) of size N=3.

The expected shape is drawn (depending on the number of levels and the length of the message).

Example: X---X---X
-X-X-X-X-
--X---X--

Then write the letters of the text starting with line 1 (defined according to the key).

Example: (2): R---F---E
(3): -E-E-E-C-
(1): --D---N--

The plain message is then readable in zig-zag from left to right.

Example: The plain text is REDEFENCE

How to recognize Redefence ciphertext?

Redefence is a transposition cipher, so the frequency analysis and the coincidence index of the message are similar to that of the plaintext language.

How to decipher Redefence without the key?

As for Rail-Fence, a brute-force attack of all levels (2 to N) is possible. Extra work is required to find the order of the lines.

What are the variants of the Redefence cipher?

Redefence is a variant of the Rail Fence cipher adding the possibility of modifying the order of reading of the lines forming the zig-zag.

Source code

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Redefence Cipher on dCode.fr [online website], retrieved on 2024-06-15, https://www.dcode.fr/redefence-cipher

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