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Vigenere Multiplicative Cipher

Tool to decrypt/encrypt with Vigenere multiplication. Vigenere Multiplication Cipher is a Vigenere variant which uses a key, but instead of making an addition, it's a multiplication.

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Vigenere Multiplicative Cipher -

Tag(s) : Cryptography, Vigenere Variant

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# Vigenere Multiplicative Cipher

## Multiplication Vigenere Encoder

Tool to decrypt/encrypt with Vigenere multiplication. Vigenere Multiplication Cipher is a Vigenere variant which uses a key, but instead of making an addition, it's a multiplication.

### How to encrypt using Multiplication Vigenere cipher?

Encryption uses a numeric key (some numbers) and a numeric message (use a alphanumeric substitution, or ascii code for example).

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: The text is 4,3,15,4,5 (for DCODE) and the key be 11,5,25 (for KEY), the result is : 4*11=44, 3*5=15, 15*25=375, 4*11=44, 5*5=25

### 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.

Example: 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

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Source : http://www.dcode.fr/multiplication-vigenere-cipher
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