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Rozier Cipher

Tool to decrypt / encrypt with Rozier. Rozier's Digit is a variant of Vigenere using the letters of the key and their positions in the Vigenere square.

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Rozier Cipher -

Tag(s) : Cryptography, Substitution Cipher

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Rozier Cipher

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Rozier to Vigenere Convertion



Tool to decrypt / encrypt with Rozier. Rozier's Digit is a variant of Vigenere using the letters of the key and their positions in the Vigenere square.

Answers to Questions

How to encrypt using Rozier cipher?

The Rozier cipher is a variant of the Vigénère cipher. To encrypt a message, locate, in a square of vigenère, the column of the letter of the plain message, go down until you find the letter of the key, then move horizontally until you locate the letter that follows in the key, and finally go up horizontally to read the letter of the column which is the encrypted letter.

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Example: To code ROZIER with the key DCODE, start with the first letter R by locating the column R, go down to D (first letter of the key), move on the line until find C (second letter of the key) and go up to read the name of the column Q which is the first encrypted letter. The complete coded message is QAOJDQ

How to decrypt Rozier cipher?

Using Vigenère's square, locate the column of the Nth encrypted letter, go down until you find the letter in position N+1 of the key, locate on the line found the letter in position N of the key, and go up in the column to note the plain letter.

Example: To decode QAOJDQ encrypted with the key DCODE, start with the first letter Q by locating the column Q, go down to C (second letter of the key), move on the line until to find D (first letter of the key) and go up to read the name of the column R which is the first letter of the plain message. The full message is ROZIER

How to recognize a Rozier ciphertext?

The Rozier cipher is a variant of Vigenere from which it takes all the cryptanalysis characteristics.

The notions of flowers, color, roses and the rosebush (Rozier homophone in French) are clues.

What is the difference between Rozier's cipher and Vigenere's cipher?

There is in fact very little difference between Rozier and Vigenere, the encryption of Rozier is identical to an encryption of Vigenère except for a change of key. Indeed, any Rozier encryption of the message M with a key C1, corresponds to Vigenère encryption of the message M a key C2.

How to convert a Rozier key to a Vigenere Key?

From a Rozier key, the Vigénère key is calculated as follows: for each letter in the Rozier key, calculate rank of the next letter - rank of the letter (modulo 26) . The letter of the key corresponds to the letter in the alphabet with the calculated rank. (The rank is from A = 0, B = 1 ...)

Example: Let Rozier's key KEY (K is rank 10, E = 4, Y = 24)
(E-K)% 26 = (4-10)% 26 = 20 = U
(Y-E) % 26 = (24-4)% 26 = 20 = U
(K-Y)% 26 = (10-24)% 26 = 12 = M
The corresponding Vigénère key is UUM.

How to decipher Rozier without key?

Use the Vigenere solver on dCode

Source code

dCode retains ownership of the online 'Rozier Cipher' tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (PHP, Java, C#, Python, Javascript, Matlab, etc.) no data, script or API access will be for free, same for Rozier Cipher download for offline use on PC, tablet, iPhone or Android !

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Thanks to your feedback and relevant comments, dCode has developped the best Rozier Cipher tool, so feel free to write! Thank you !


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