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.

Vigenere Multiplication Cipher - dCode

Tag(s) : Cryptography,Vigenere Variant

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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.

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

One takes 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 lenght is inferior of the text lenght, one starts over the key.

Let the text be 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

Decryption requires a key and a numeric text.

Let the ciphered message be 44,15,375,44,25 and the key 11,5,25 (for KEY)

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

44/11=4, 15/5/= etc.

The original plain text is 4,3,15,4,5 (DCODE).

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

One can crack vigenere multiplication by trying to find the lenght for which GCD of values are the greatest.

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

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