Affine cipher is a monoalphabetic substitution cipher.

• Encryption is done as, E ( x ) = ( a x + b ) mod m modulus m: size of the alphabet a and b: key of the cipher. a and m need to be coprime

• Decryption is done as, D ( x ) = a^-1 ( x - b ) mod m a^-1 : modular multiplicative inverse of a modulo m

• This is a generalized code where you can give alphabets of any language using input file and it will perform encryption and decryption in that language

📢📢 You can see the output for Hindi Language,below 📢📢

• Please save the alphabets of any language in file named as input.txt. This file is input for this program
• Please save plain text in a file having alphabets from same language as input file. This file is also an input to this program and it's name should be plaintext.txt
• Enter the value of variable "a" and variable "b" from console
• You can see the output of encryption and decryption in output.txt file. This file will get generated in "C:\Program Files\Java\jdk-18.0.2.1\bin" location of your system

NOTE: Please execute the program from "C:\Program Files\Java\jdk-18.0.2.1\bin" location of your system. Also save the input.txt file and plaintext.txt file in the same location.