Tool to decrypt/encrypt with modulo. Modulo calculations applied on numbers can make possible ciphering using the calculated values.

Modulo Cipher - dCode

Tag(s) : Cryptography,Substitution Cipher,Homophonic Substitution Cipher

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Tool to decrypt/encrypt with modulo. Modulo calculations applied on numbers can make possible ciphering using the calculated values.

Encryption uses the modulo value and a sequence of numbers, characters have to be converted into numbers, e.g. A=1, B=2, ... Z=26, but any conversion like the ASCII table is fine.

One wants to crypt DCODE so 4,3,15,4,5 with the modulo 26.

For each number to encrypt, one calculates a random number which value is equal to the number to crypt.

For 4 one takes, for example 654, because 654 % 26 = 4

For 3 one takes, for example 965 because 965 % 26 = 3

The encrypted message is 654,965,561,732,941 (some other cipher message are possible)

Decryption requires to know the value of the Modulo and to know the series of number to decrypt.

Let 654,965,561,732,941 be the message and 26 the modulo.

For each number N one calculates the value of the remainder in the euclidean division of N by the modulo to get the plain number.

The plain text is 4,3,15,4,5, that one can translate into DCODE with A=1, B=2, ...

The ciphered message is constituted of somehow large random numbers.

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Source : http://www.dcode.fr/modulo-cipher

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