crack

crack an affine cipher

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we want to crack this message number 459

from the public message board at crypto

club org we know it was encrypted using

an affine cipher but we don't know the

key there are three ways to approach

cracking an affine cipher first look at

frequencies and word patterns to

determine a few letters in Words with

luck we can crack the entire message

this way but we only need to find the

encryption of two different letters to

use algebra to find the multiplicative

an additive keys then decrypt the rest

of the message using these keys

a third way is to look for patterns in

the cipher table we know how to

construct an affine cipher table using

the multiplicative and additive keys so

let's see how this method works here's

our message on the crack substitution

tool we'll be looking for number