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Vigenere Multiplicative Cipher

Tool to decrypt/encrypt with Vigenere multiplication. Vigenere Multiplicative Cipher is a Vigenere variant which uses a key, but replaces an addition by a multiplication.

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Vigenere Multiplicative Cipher -

Tag(s) : Poly-Alphabetic Cipher

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Vigenere Multiplicative Cipher

Vigenere Multiplication Decoder






See also: Vigenere Cipher

Multiplication Vigenere Encoder




See also: Vigenere Cipher

Answers to Questions (FAQ)

How to encrypt using Multiplication Vigenere cipher?

Vigenere Multiplication Encryption uses a numeric key (some numbers) and a numeric message (use an alphanumeric substitution A1Z26, or ASCII code for example).

Example: Encode 4,3,15,4,5 (for DCODE) with the key 11,5,25 (for KEY)

Take the first number of the message and the first number of the key and multiply them, the result is the product's value. Same for the next numbers of the message and the key.

If the key length is inferior of the text lenght, start over the key.

Example: Calculate 4*11=44, 3*5=15, 15*25=375, 4*11=44, 5*5=25 to get the cipher message 44,15,375,44,25

Plain numbers431545
Key numbers11525115
Cipher numbers44153754425

How to decrypt Multiplication Vigenere cipher?

Decryption requires a key and a numeric text.

Example: The ciphered message is 44,15,375,44,25 and the key 11,5,25 (for KEY)

Divide the first number of the message by the second number of the key. Write the result (which must be integer). Same for the next numbers of the message and the key.

Example: 44/11=4, 15/5=3 etc. The original plain text is 4,3,15,4,5 (DCODE).

How to recognize Vigenere Multiplication ciphertext?

The message is made of numbers with 1 to 5 digits, none is prime.

How to decipher Vigenere Multiplication without key?

Vigenere multiplication can be cracked by trying to find the length for which GCD of values are the greatest.

Source code

dCode retains ownership of the online "Vigenere Multiplicative Cipher" source code. Except explicit open source licence (indicated CC / Creative Commons / free), the "Vigenere Multiplicative Cipher" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or the "Vigenere Multiplicative Cipher" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, copy-paste, or API access for "Vigenere Multiplicative Cipher" are not public, same for offline use on PC, tablet, iPhone or Android ! Remainder : dCode is free to use.

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Please, check our dCode Discord community for help requests!
NB: for encrypted messages, test our automatic cipher identifier!

Questions / Comments

Thanks to your feedback and relevant comments, dCode has developed the best 'Vigenere Multiplicative Cipher' tool, so feel free to write! Thank you!


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