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Gronsfeld Cipher

Tool to decrypt/encrypt using Gronsfeld. Gronsfeld Cipher is a variant of the Vigenère cipher, the difference being that the key is a number.

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Gronsfeld Cipher -

Tag(s) : Cryptography, Vigenere Variant

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Gronsfeld Cipher

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Tool to decrypt/encrypt using Gronsfeld. Gronsfeld Cipher is a variant of the Vigenère cipher, the difference being that the key is a number.

Answers to Questions

How to encrypt using Gronsfeld cipher?

Gronsfeld encryption uses the Vigenerehref method, the difference being that the key is directly numeric, no need to calculate the rank of the letters of the key in the alphabet. However, the corresponding shifts have to be applied, so the Gronsfeld method approaches a multi-shift encryptionhref.

Consider the message to be encrypted GRONSFELD with the key 1234. You add 1 to G to get H (the letter 1 rank after G is H in the alphabet), then add 2 to C or E (the letter 2 ranks after C is E), and so on.

Plain letterGRONSFELD
Key (repeated)123412341
Cipher LetterHTRRTHHPE

The encrypted message is HTRRTHHPE.

How to decrypt Gronsfeld cipher?

Decryption requires to know the decryption key (and the alphabet used if necessary). The decryption identical to Vigenerehref, but with a numeric key.

Consider the encrypted message EEREG with the key 123

Ciphertext LetterEEREG
Key (Repeated)12312
Decrypted LetterDCODE

The plain message is then DCODE.

How to recognize Gronsfeld ciphertext?

The message has an index of coincidencehref of about 0.4 to 0.5.

How to decipher Gronsfeld without key?

Cryptanalysis techniques used for Vigenerehref are also applicable to Gronsfeld. These techniques also accelerated since the use of a numeric key limits the number of combinationshref.

What are the variants of the Gronsfeld cipher?

Gronsfeld variants are the same as Vigenerehref variants.

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Source code

dCode retains ownership of the source code of the script Gronsfeld Cipher. Except explicit open source licence (indicated Creative Commons / free), any algorithm, applet, snippet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in any informatic langauge (PHP, Java, C#, Python, Javascript, etc.) which dCode owns rights can be transferred after sales quote. So if you need to download the Gronsfeld Cipher script for offline use, for you, your company or association, see you on contact page !

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