Caesar Cipher in Lua

Code Structure

There are three files of code in this project.

• caesar.lua - contains all the logic of the actual cipher
• encrypt.lua - thin wrapper that takes shift and plaintext from console input and outputs encrypted text
• decrypt.lua - thin wrapper that takes shift and ciphertext from console input and outputs plaintext text

How to Use

Encryption

$ lua encrypt.lua
Caesar Cipher Encryption Program
Please enter the shift: 
23
Please enter the plain text (press CTRL-D when done)
Hello, good afternoon!


Encrypted output: 

Ebiil, dlla xcqbokllk!

Decryption

lua decrypt.lua 
Caesar Cipher Decryption Program
Please enter the shift: 
23
Please enter the encrypted text (press CTRL-D when done)
Ebiil, dlla xcqbokllk!


Decrypted output: 

Hello, good afternoon!