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

Modulo Cipher - dCode

Tag(s) : Homophonic Substitution Cipher

dCode is free and its tools are a valuable help in games, maths, geocaching, puzzles and problems to solve every day!

A suggestion ? a feedback ? a bug ? an idea ? *Write to dCode*!

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

**Modulo Cipher** Encryption uses modular arithmetics and a sequence of numbers, characters must be converted into numbers, e.g. A=1, B=2, ... Z=26, but any numeric conversion (like the ASCII table) is fine.

__Example:__ To crypt DCODE with the modulo 26, convert the text to numbers 4,3,15,4,5.

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

__Example:__ For $ 4 $, take $ 654 $, as $ 654 \equiv 4 \ mod 26 $

For $ 3 $, take $ 965 $, as $ 965 \equiv 3 \ mod 26 $.

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

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

__Example:__ The encrypted message is 654,965,561,732,941with the modulo 26.

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

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

The ciphered message is constituted of somehow large random numbers.

The Affine cipher use modulo in the calculation $ C = a \times P + b \ mod 26 $

dCode retains ownership of the online 'Modulo Cipher' tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (PHP, Java, C#, Python, Javascript, Matlab, etc.) no data, script or API access will be for free, same for Modulo Cipher download for offline use on PC, tablet, iPhone or Android !

Please, check our community Discord for help requests!

modulo,cipher,remainder,division,calculator,modular,euclide,euclidean,mod,modulus

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

© 2020 dCode — The ultimate 'toolkit' to solve every games / riddles / geocaching / CTF.

Feedback

▲