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 Multiplicative 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).

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

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).

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

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

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