FAQs for Affine Cipher Crypto Corner

What is the Affine cipher? (Definition)

Affine encryption is the name given to a substitution cipher whose correspondence is given by an affine function endowed with 2 coefficients A a...Read more

How to encrypt using the Affine cipher?

Encryption uses a classic alphabet, and two integers, called coefficients or keys A and B , these are the parameters of the affine function Ax+B...Read more

How to decrypt the Affine cipher?

Affine decryption requires to know the two keys A and B (the one from encryption) and the used alphabet. Example: Decrypt the ciphered messa...Read more

How to recognize an Affine ciphertext?

A message encrypted by Affine has a coincidence index close to the plain text language's one. Any reference to an affine function (in a straigh...Read more

How to decipher Affine without coefficients A and B?

To crack Affine , it is possible to bruteforce/test all values for A and B coefficients. Use the Brute-force attack button. If the alphabet is 26...Read more

How to compute the decryption function?

For an affine encryption with the function $ y = A x + B $, then the reciprocal/inverse decryption function is expressed $ y' = A' x + B $Read more

How to compute A' value?

Calculate the modular inverse of A, modulo the length of the alphabet (see below for pre-calculated values).Read more

How to compute B' value?

B' has the same value as B, for this reason, this variable should not be called B' but B.Read more

What are the A' values?

The value of A' depends on A but also on the alphabet's length, if it is a classic one, it is 26 characters long. The values of A' are then: A = 1...Read more

What is an affine cipher?

Affine cipher. The affine cipher is a type of monoalphabetic substitution cipher, wherein each letter in an alphabet is mapped to its numeric equivalent, encrypted using a simple mathematical function, and converted back to a letter. The formula used means that each letter encrypts to one other letter, and back again,...

How to decrypt/encrypt with affine?

Tool to decrypt/encrypt with Affine automatically. The Affine cipher uses a encrypting function with additions and multiplication (as the mathematical affine function) which convert a letter (of value x in a 26 letters alphabet) into another letter with value (ax + b) modulo 26.

What is crypto corner?

Welcome to Crypto Corner This website is dedicated to explaining clearly how a variety of codes and ciphers work, how to use them to both encrypt and decrypt a message, and how to use methods to help break a code that you have intercepted. The site is very much a work in progress at the moment, with many of the sections still under construction.

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